{"id":13000,"date":"2025-09-25T12:44:24","date_gmt":"2025-09-25T11:44:24","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=13000"},"modified":"2026-01-16T11:12:07","modified_gmt":"2026-01-16T11:12:07","slug":"transport-system-in-plant-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/09\/25\/transport-system-in-plant-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Transport system in plant Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">1. The movement of molecules from a region of higher concentration to lower concentration is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Osmosis<br>B) Diffusion<br>C) Active transport<br>D) Imbibition<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Diffusion is a passive movement of molecules along the concentration gradient.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">2. The movement of water through a semi-permeable membrane is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Diffusion<br>B) Osmosis<br>C) Imbibition<br>D) Transpiration<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Osmosis is the passive diffusion of water molecules across a semipermeable membrane.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">3. Imbibition is important in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root elongation<br>B) Seed germination<br>C) Photosynthesis<br>D) Transpiration<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Dry seeds imbibe water due to hydrophilic colloids in seed coats, initiating germination.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">4. A solution with lower solute concentration compared to another is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Isotonic<br>B) Hypotonic<br>C) Hypertonic<br>D) None of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  In hypotonic solutions, water moves into cells causing swelling.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">5. Plasmolysis occurs when a cell is placed in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Hypotonic solution<br>B) Isotonic solution<br>C) Hypertonic solution<br>D) Distilled water<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Water moves out of the cell, protoplast shrinks away from cell wall.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">6. The pressure responsible for water absorption in roots is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root pressure<br>B) Osmotic pressure<br>C) Turgor pressure<br>D) Diffusion pressure<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Root pressure develops due to osmotic uptake of water in xylem.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">7. Which instrument is used to study plasmolysis?<br><\/mark><\/strong>A) Simple microscope<br>B) Compound microscope<br>C) Electron microscope<br>D) X-ray diffraction<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Plasmolysis can be observed in epidermal peel cells under compound microscope.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">8. When the cell wall resists further entry of water, the cell is said to be<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Flaccid<br>B) Turgid<br>C) Plasmolysed<br>D) Hypertonic<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Turgid cells exert turgor pressure against the cell wall.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">9. Water potential of pure water is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) 1<br>B) 0<br>C) \u20131<br>D) 100<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Pure water has maximum water potential taken as zero.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">10. Active transport in plants requires<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) ATP energy<br>B) Osmosis<br>C) Diffusion<br>D) Imbibition<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Active transport moves molecules against concentration gradient using energy.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">11. Symplastic movement of water occurs through<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Cell wall<br>B) Cytoplasm via plasmodesmata<br>C) Vacuole only<br>D) Xylem vessels only<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Symplast pathway involves protoplasmic continuum of adjacent cells.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">12. Apoplastic movement of water occurs through<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Vacuoles<br>B) Cytoplasm<br>C) Cell walls and intercellular spaces<br>D) Plasmodesmata<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Apoplast is non-living pathway outside plasma membrane.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">13. The symplastic pathway is interrupted by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Xylem<br>B) Phloem<br>C) Casparian strips<br>D) Pith<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Suberized Casparian strips block apoplastic flow in endodermis forcing symplastic entry.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">14. The first step in water absorption by roots is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Diffusion<br>B) Active transport<br>C) Osmosis<br>D) Imbibition<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D <\/b><BR>\n<b>Explanation:<\/b>  Root hairs imbibe water before osmotic entry.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">15. The term water potential was introduced by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) van\u2019t Hoff<br>B) Slatyer &amp; Taylor<br>C) Dixon &amp; Joly<br>D) Strasburger<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  They introduced the concept of water potential in 1960s.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">16. When a cell is in isotonic solution, its water potential is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Higher than outside<br>B) Lower than outside<br>C) Equal to outside<br>D) Zero<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  In isotonic solution, no net water movement occurs.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">17. Root pressure is maximum in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Dry season<br>B) Early spring<br>C) Rainy season<br>D) Midday summer<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Root pressure is high in spring when transpiration is low.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">18. The swelling of wooden doors in rainy season is due to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Osmosis<br>B) Imbibition<br>C) Diffusion<br>D) Capillarity<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Wood imbibes water and swells.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">19. The units of water potential are<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Calories<br>B) Joules<br>C) Pascal (pressure units)<br>D) Litres<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Water potential is expressed in pressure units (MPa).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">20. The diffusion pressure deficit (DPD) is equivalent to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Osmotic pressure \u2013 Turgor pressure<br>B) Osmotic pressure + Turgor pressure<br>C) Osmotic pressure \u2013 Wall pressure<br>D) Water potential \u00d7 Turgor pressure<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>   DPD = OP \u2013 TP; driving force for water absorption.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">21. The entry of water into guard cells causing stomatal opening is due to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Active transport of K\u207a<br>B) Passive diffusion of CO\u2082<br>C) Plasmolysis<br>D) Protein synthesis<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  K\u207a influx lowers water potential, water enters guard cells, stomata open.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">22. Endosmosis occurs when a cell is placed in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Hypotonic solution<br>B) Hypertonic solution<br>C) Isotonic solution<br>D) None of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Water enters the cell, making it turgid.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">23. Exosmosis occurs when a cell is placed in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Hypotonic solution<br>B) Hypertonic solution<br>C) Isotonic solution<br>D) Distilled water<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Water leaves the cell, leading to plasmolysis.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">24. The movement of water from soil into xylem across cortex is mainly<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Apoplastic &amp; Symplastic<br>B) Only active<br>C) Only through vacuoles<br>D) By guttation<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Water moves via apoplast and symplast across root tissues.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">25. In higher plants, water mainly moves upward through<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Phloem<br>B) Xylem<br>C) Cortex<br>D) Cambium<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Xylem vessels and tracheids transport water and minerals.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">26. The main region of water absorption in roots is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root cap<br>B) Meristematic zone<br>C) Zone of root hairs<br>D) Zone of elongation<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Root hairs greatly increase surface area for water absorption.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">27. Water absorption by roots is mostly<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Passive<br>B) Active<br>C) Imbibition<br>D) Endosmosis<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Most water uptake occurs due to transpiration pull (a passive process).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">28. Root pressure is best demonstrated by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Plasmolysis experiment<br>B) Guttation<br>C) Transpiration<br>D) Phototropism<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Root pressure pushes water out through hydathodes at leaf tips, seen as guttation drops.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">29. The ascent of sap in tall trees is best explained by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root pressure theory<br>B) Capillarity theory<br>C) Cohesion-tension theory<br>D) Imbibition theory<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Dixon &#038; Joly proposed that water rises due to transpiration pull and cohesion of water molecules.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">30. Capillary theory is insufficient to explain ascent of sap because<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Water is not cohesive<br>B) Trees are tall (up to 100 m)<br>C) Root pressure is absent<br>D) It requires ATP<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Capillary rise cannot explain movement of water beyond a few meters.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">31. The cohesion-tension theory was proposed by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><\/mark><\/strong><br>A) Strasburger<br>B) Dixon &amp; Joly<br>C) Bose<br>D) Priestley<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  They proposed this widely accepted theory in 1894.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">32. Maximum transpiration occurs through<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Lenticels<br>B) Cuticle<br>C) Stomata<br>D) Hydathodes<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Stomata account for ~90% of total transpiration.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">33. The cuticular transpiration is minimum in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Xerophytes<br>B) Hydrophytes<br>C) Mesophytes<br>D) Halophytes<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Xerophytes have thick cuticles to reduce water loss.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">34. The loss of water in liquid form through hydathodes is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Transpiration<br>B) Guttation<br>C) Exudation<br>D) Dew<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Root pressure pushes liquid water through hydathodes.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">35. Stomata open due to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Loss of turgor in guard cells<br>B) Gain of turgor in guard cells<br>C) Photosynthesis in spongy cells<br>D) Root pressure<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Turgid guard cells bend, opening stomatal pore.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">36. Which factor closes stomata?<br><\/mark><\/strong>A) Blue light<br>B) Absorption of K\u207a by guard cells<br>C) Abscisic acid (ABA)<br>D) Photosynthesis<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  ABA induces stomatal closure during drought stress.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">37. The driving force of transpiration pull is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root pressure<br>B) Water potential gradient<br>C) Guttation<br>D) Osmosis<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Water moves upward along gradient created by evaporation from leaves.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>38. The first step of transpiration is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/strong><\/mark>A) Movement into xylem<br>B) Evaporation from mesophyll cells into intercellular spaces<br>C) Diffusion out through stomata<br>D) Root pressure<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Water evaporates from mesophyll into leaf air spaces before diffusing out.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">39. The transpiration ratio is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) CO\u2082 fixed \/ water lost<br>B) Water lost \/ CO\u2082 fixed<br>C) O\u2082 released \/ water lost<br>D) Water absorbed \/ water transpired<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  It measures efficiency of water use during photosynthesis.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">40. Transpiration is measured by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Potometer<br>B) Hygrometer<br>C) Psychrometer<br>D) Porometer<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Potometer (Ganong\u2019s potometer) measures water uptake as an indirect measure of transpiration.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">41. The least transpiration occurs in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Xerophytes<br>B) Hydrophytes<br>C) Mesophytes<br>D) Halophytes<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Aquatic plants lose little water due to availability of surrounding water.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">42. The phenomenon of guttation occurs mainly at<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Stomata<br>B) Lenticels<br>C) Hydathodes<br>D) Cuticle<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Specialized pores at leaf margins exude water drops due to root pressure.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">43. Which plant will show maximum transpiration rate?<br><\/mark><\/strong>A) Cactus<br>B) Mango<br>C) Lotus<br>D) Water hyacinth<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Mesophytes like mango have broad leaves with many stomata, leading to higher transpiration.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">44. During midday in summer, the rate of transpiration<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Increases continuously<br>B) Decreases due to stomatal closure<br>C) Remains constant<br>D) Stops completely<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  High temperature + water stress causes stomata to close at midday.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">45. Transpiration helps in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Cooling leaves<br>B) Ascent of sap<br>C) Distribution of minerals<br>D) All of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Transpiration aids in cooling, nutrient movement, and water transport.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">46. Antitranspirants reduce transpiration by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Increasing photosynthesis<br>B) Inducing stomatal closure<br>C) Increasing root pressure<br>D) Breaking hydrogen bonds<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Substances like ABA, phenylmercuric acetate reduce transpiration.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">47. Water is pulled upward in xylem mainly due to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root pressure<br>B) Cohesion and adhesion of water<br>C) Imbibition<br>D) Capillarity alone<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Cohesion-tension mechanism explains long-distance water transport.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">48. Which plant shows Crassulacean Acid Metabolism (CAM) to reduce transpiration?<br><\/mark><\/strong>A) Rice<br>B) Wheat<br>C) Opuntia<br>D) Mango<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  CAM plants open stomata at night to minimize water loss.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">49. Xerophytes conserve water by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Thick cuticle<br>B) Sunken stomata<br>C) Reduced leaf area<br>D) All of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  All are adaptations to reduce transpiration in dry habitats.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">50. The ascent of sap stops when<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root pressure is low<br>B) Cohesion of water is lost (air embolism)<br>C) Temperature is high<br>D) Cuticle is thick<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Air bubbles in xylem break the water column continuity, stopping sap ascent.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">51. The main conducting tissue for mineral nutrients in plants is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Phloem<br>B) Xylem<br>C) Cortex<br>D) Cambium<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>   Xylem transports water and minerals absorbed from the soil.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">52. Essential elements are those which<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Are required in large amounts only<br>B) Cannot be replaced by other elements<br>C) May or may not be required for metabolism<br>D) Are required only in hydroponics<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  An element is considered essential if its absence prevents plant growth and no other element can replace it.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">53. Hydroponics is a technique used to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Study root nodules<br>B) Grow plants without soil<br>C) Prevent transpiration<br>D) Increase guttation<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Hydroponics (solution culture) is used to study mineral requirements of plants.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">54. Which mineral is part of chlorophyll?<br><\/mark><\/strong>A) Calcium<br>B) Magnesium<br>C) Iron<br>D) Sulphur<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Magnesium forms the central atom of chlorophyll molecules.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">55. Which mineral is essential for nitrogen fixation in legumes?<br><\/mark><\/strong>A) Boron<br>B) Iron &amp; Molybdenum<br>C) Potassium<br>D) Calcium<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Both are cofactors of nitrogenase enzyme involved in biological nitrogen fixation.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">56. Necrosis (death of tissues) is mainly due to deficiency of<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) K, Ca, Mg<br>B) Fe, Mn, Zn<br>C) Mo, B<br>D) Na, Cl<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Deficiency of these minerals leads to death of cells and tissues in leaves.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">57. Chlorosis (yellowing of leaves) is caused by deficiency of<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) N, K, Mg, Fe, S, Mo<br>B) Ca, B, Mn<br>C) Na, Cl, Zn<br>D) P, Cu, Mn<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  These minerals are required for chlorophyll formation; deficiency causes chlorosis.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">58. Which mineral is needed for photolysis of water during photosynthesis?<br><\/mark><\/strong>A) Fe<br>B) Mn<br>C) Mg<br>D) Ca<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Manganese ions are essential for water-splitting complex in PSII.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">59. Which mineral is most immobile in plants?<br><\/mark><\/strong>A) Nitrogen<br>B) Phosphorus<br>C) Calcium<br>D) Potassium<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Calcium is not translocated easily, hence deficiency symptoms appear in young leaves first.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">60. Which mineral is required for synthesis of auxin (IAA)?<br><\/mark><\/strong>A) Fe<br>B) Zn<br>C) Cu<br>D) Mg<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Zinc is a cofactor for enzymes involved in tryptophan to IAA conversion.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">61. The main tissue for transport of organic food in plants is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Xylem<br>B) Phloem<br>C) Cambium<br>D) Endodermis<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Phloem transports sucrose and other organic solutes.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">62. Food is transported in phloem mainly in the form of<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Glucose<br>B) Fructose<br>C) Sucrose<br>D) Starch<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Sucrose is the common transport sugar in most plants.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">63. In phloem, which cells are responsible for transport?<br><\/mark><\/strong>A) Companion cells &amp; sieve tube elements<br>B) Tracheids &amp; vessels<br>C) Phloem parenchyma<br>D) Cambium cells<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Sieve tubes transport food, and companion cells help in loading\/unloading.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">64. The direction of food transport in phloem is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Only upward<br>B) Only downward<br>C) Both upward and downward<br>D) Random<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Food is transported bidirectionally depending on source-sink relationship.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">65. The pressure-flow hypothesis was proposed by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Dixon &amp; Joly<br>B) M\u00fcnch<br>C) Strasburger<br>D) Priestley<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  In 1930, M\u00fcnch proposed the mass flow or pressure-flow hypothesis for phloem transport.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">66. According to pressure-flow hypothesis, transport in phloem occurs due to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root pressure<br>B) Turgor pressure gradient<br>C) ATP energy only<br>D) Cohesion-tension<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Osmotic pressure builds in source region, creating a pressure difference moving food to sink.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">67. In phloem loading, sugars move from mesophyll cells into sieve tubes by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Passive diffusion<br>B) Active transport<br>C) Osmosis<br>D) Capillarity<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Energy (ATP) is required to load sucrose against concentration gradient into sieve tubes.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">68. In pressure-flow mechanism, \u201csource\u201d refers to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Organs where food is utilized<br>B) Organs where food is stored<br>C) Organs where food is synthesized<br>D) Root apex<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Source = photosynthetic leaves that produce sugars.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">69. In pressure-flow mechanism, \u201csink\u201d refers to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Leaves<br>B) Roots, fruits, seeds<br>C) Xylem<br>D) Cambium<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Sink = tissues where sugars are stored or consumed.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">70. Phloem transport is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Apoplastic<br>B) Symplastic<br>C) Both apoplastic and symplastic<br>D) Vacuolar only<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Sugars move by symplast (plasmodesmata) and apoplast (active loading into phloem).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">71. Translocation of food in phloem requires<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Light<br>B) ATP<br>C) Oxygen<br>D) Both B and C<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  ATP and aerobic respiration provide energy for phloem loading\/unloading.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">72. The translocation rate in phloem is<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) 1 mm\/hour<br>B) 1 m\/hour<br>C) 1 cm\/day<br>D) 0.1 mm\/day<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Food moves rapidly in phloem compared to diffusion.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>73. The girdling experiment (removal of phloem) shows that<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/strong><\/mark>A) Water transport occurs in phloem<br>B) Food transport occurs in phloem<br>C) Minerals move in cortex<br>D) Transpiration pull occurs in phloem<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Swelling above girdled area proves food is transported through phloem.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">74. The sieve plates in phloem are present in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Sieve tube elements<br>B) Companion cells<br>C) Xylem tracheids<br>D) Phloem parenchyma<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Sieve plates are perforated walls of sieve tubes facilitating transport.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">75. The energy for phloem transport comes from<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Photosynthesis directly<br>B) Active loading by companion cells<br>C) Transpiration pull<br>D) Root pressure<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Companion cells use ATP to load sugars into sieve tubes, generating pressure flow.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">76. The cohesion-tension theory of water transport explains<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Phloem transport<br>B) Ascent of sap in xylem<br>C) Mineral nutrition<br>D) Osmosis in root hairs<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Cohesion-tension theory (Dixon &#038; Joly) explains upward pull of water due to transpiration.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">77. Root pressure alone cannot account for water rise in tall trees because<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) It is too weak<br>B) It occurs only at night<br>C) It is absent in dry soil<br>D) All of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  Root pressure is weak and insufficient to explain ascent of sap beyond a few meters.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">78. Which condition favours guttation?<br><\/mark><\/strong>A) Low root pressure, high transpiration<br>B) High root pressure, low transpiration<br>C) High transpiration, high temperature<br>D) None of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Guttation occurs at night\/early morning when transpiration is low but root pressure is high.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">79. Transpiration pull is strongest in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Midday<br>B) Midnight<br>C) Early morning<br>D) Evening<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  High temperature and low humidity at midday cause maximum transpiration pull.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">80. Which experiment proves that food is translocated through phloem?<br><\/mark><\/strong>A) Plasmolysis experiment<br>B) Girdling experiment<br>C) Potometer experiment<br>D) Bell jar experiment<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Removing a ring of bark (phloem) causes accumulation of food above the girdle.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">81. Food translocation in plants is always<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) From root to shoot<br>B) From leaves to roots only<br>C) From source to sink<br>D) Random<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Food transport direction depends on where it is produced (source) and where it is needed (sink).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">82. The rate of translocation in phloem is approximately<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) 1 cm\/hr<br>B) 1 m\/hr<br>C) 1 cm\/day<br>D) 1 mm\/hr<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Phloem transport is rapid compared to diffusion.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">83. Which plant shows CAM photosynthesis to conserve water?<br><\/mark><\/strong>A) Wheat<br>B) Rice<br>C) Opuntia<br>D) Mango<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  CAM plants open stomata at night, reducing water loss.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">84. The transpiration-cohesion theory fails if<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Water molecules lose cohesion (embolism)<br>B) Transpiration rate decreases<br>C) Light intensity is low<br>D) Root pressure develops<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Air bubbles in xylem break water column, stopping ascent of sap.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">85. In hydrophytes, cuticle and transpiration are<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Thick and high<br>B) Absent and negligible<br>C) Thick and negligible<br>D) Thin and high<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Aquatic plants don\u2019t need thick cuticle as water loss is not an issue.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>86. Xerophytes minimize water loss by<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/strong><\/mark>A) Thick cuticle<br>B) Sunken stomata<br>C) Reduced leaves (spines)<br>D) All of these<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  These are common xerophytic adaptations.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">87. The movement of sugars from mesophyll cells to phloem is called<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Phloem loading<br>B) Phloem unloading<br>C) Transpiration pull<br>D) Mineral transport<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Sugars are actively loaded into sieve tubes from source cells.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">88. Water absorption through mycorrhizal association is most important for<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Nitrogen<br>B) Potassium<br>C) Phosphorus<br>D) Calcium<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Mycorrhiza greatly enhances phosphorus uptake.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">89. Which ion plays a major role in stomatal movement?<br><\/mark><\/strong>A) Na\u207a<br>B) K\u207a<br>C) Ca\u00b2\u207a<br>D) Mg\u00b2\u207a<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Active uptake of K\u207a by guard cells regulates stomatal opening\/closure.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">90. During drought stress, stomata close due to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Auxin<br>B) Abscisic acid (ABA)<br>C) Cytokinin<br>D) Ethylene<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  ABA induces stomatal closure to conserve water.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">91. In phloem, the living cells that assist sieve tubes are<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Phloem fibres<br>B) Phloem parenchyma<br>C) Companion cells<br>D) Cambium cells<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C <\/b><BR>\n<b>Explanation:<\/b>  Companion cells help in loading\/unloading of sugars into sieve tubes.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">92. In tall trees, ascent of sap occurs mainly due to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Root pressure<br>B) Transpiration pull<br>C) Capillarity<br>D) Osmosis<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Root pressure is insufficient; cohesion-tension mechanism explains water rise.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">93. Which plant factor reduces transpiration?<br><\/mark><\/strong>A) Large leaf area<br>B) Sunken stomata<br>C) Thin cuticle<br>D) High stomatal frequency<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Sunken stomata reduce water loss by trapping humid air.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">94. In girdling experiment, food accumulates<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Below the girdle<br>B) Above the girdle<br>C) Both above and below<br>D) At the root tip<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Phloem is removed, so sugars cannot move downward.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">95. Which factor reduces the rate of transpiration?<br><\/mark><\/strong>A) High temperature<br>B) Low humidity<br>C) High wind velocity<br>D) High atmospheric humidity<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: D  <\/b><BR>\n<b>Explanation:<\/b>  When air is already saturated with water, transpiration rate decreases.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">96. The process of guttation is mainly seen in<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) Tall trees<br>B) Herbs with large leaves<br>C) Succulents<br>D) Xerophytes<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Guttation occurs through hydathodes, commonly in plants like tomato, colocasia, grasses.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"><strong>97. Active transport in phloem requires<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/strong><\/mark>A) ATP<br>B) Osmosis<br>C) Root pressure<br>D) Cohesion<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: A  <\/b><BR>\n<b>Explanation:<\/b>  Loading and unloading of sugars in phloem requires metabolic energy.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">98. The closing of stomata at night is mainly due to<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\"> ____________.<\/mark><\/strong><br><\/mark><\/strong>A) CO\u2082 accumulation<br>B) Loss of turgor in guard cells<br>C) High transpiration rate<br>D) ABA action<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: B  <\/b><BR>\n<b>Explanation:<\/b>  Guard cells lose water at night \u2192 stomata close.\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">99. Which statement is correct regarding translocation of food?<br><\/mark><\/strong>A) It occurs only in downward direction<br>B) It occurs only during the day<br>C) It occurs both upward and downward<br>D) It is independent of source and sink<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  Phloem translocation is bidirectional (source to sink).\n <\/p>\n<\/div>\n\n\n\n<p class=\"has-large-font-size\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-luminous-vivid-orange-color\">100. Which is the most accepted theory of food transport in plants?<br><\/mark><\/strong>A) Diffusion theory<br>B) Protoplasmic streaming theory<br>C) Pressure-flow hypothesis<br>D) Electro-osmotic theory<\/p>\n\n\n\n<button class=\"acc\">Show Answer<\/button>\n<div class=\"pnl\">\n  <p style=\"font-size: 22px;\"><b> Answer: C  <\/b><BR>\n<b>Explanation:<\/b>  M\u00fcnch\u2019s pressure-flow (mass flow) hypothesis is widely accepted for phloem translocation.\n <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1. The movement of molecules from a region of higher concentration to lower concentration is called ____________.A) OsmosisB) DiffusionC) Active transportD) Imbibition Show Answer Answer: B Explanation: Diffusion is a passive movement of molecules along the concentration gradient. 2. The movement of water through a semi-permeable membrane is called ____________.A) DiffusionB) OsmosisC) ImbibitionD) Transpiration Show<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[16623,16607,16152,16133,16490,16154,16147,16158,16139,16529,16506,16597,16515,16618,16135,16624,16494,5649,5652,5623,16533,16606,16632,16616,16487,16625,16613,16617,16628,16512,16614,16629,16265,16550,16626,16532,16610,16627,16611,16601,16620,16608,16603,16621,16633,16612,16630,11007,16609,16619,16631,16622,16605,16604,16615],"class_list":{"0":"post-13000","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-biology","7":"tag-active-and-passive-transport","8":"tag-ascent-of-sap","9":"tag-biology-concepts","10":"tag-biology-mcqs","11":"tag-biology-practice-questions","12":"tag-biology-questions-and-answers","13":"tag-biology-quiz","14":"tag-biology-revision","15":"tag-biology-study-material","16":"tag-botany-mcqs","17":"tag-botany-questions","18":"tag-botany-study-guide","19":"tag-class-11-biology-mcqs","20":"tag-cohesion-tension-theory","21":"tag-competitive-exam-biology","22":"tag-diffusion-in-plants","23":"tag-important-biology-topics","24":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","25":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-examsin-kannada","26":"tag-mcqs-for-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","27":"tag-mcqs-with-answers-and-explanations","28":"tag-mineral-transport-in-plants","29":"tag-movement-of-solutes-in-plants","30":"tag-movement-of-water-in-plants","31":"tag-neet-biology-mcqs","32":"tag-osmosis-in-plants","33":"tag-phloem-transport","34":"tag-plant-absorption","35":"tag-plant-anatomy-and-function","36":"tag-plant-biology","37":"tag-plant-circulatory-system","38":"tag-plant-nutrition-transport","39":"tag-plant-physiology","40":"tag-plant-physiology-notes","41":"tag-plant-root-system","42":"tag-plant-science-quiz","43":"tag-plant-transport","44":"tag-plant-transport-mechanism","45":"tag-root-pressure","46":"tag-science-quiz-biology","47":"tag-structure-of-vascular-tissue","48":"tag-translocation-of-food","49":"tag-transpiration","50":"tag-transpiration-pull","51":"tag-transport-in-xylem-and-phloem","52":"tag-transport-of-nutrients","53":"tag-transport-of-substances-in-plants","54":"tag-transport-system-in-plant-top-100-mcqs-with-answer-and-explanation","55":"tag-transport-system-in-plants-mcqs","56":"tag-vascular-bundle-function","57":"tag-water-and-mineral-uptake","58":"tag-water-potential","59":"tag-water-transport-in-plants","60":"tag-xylem-and-phloem","61":"tag-xylem-function"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13000","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/comments?post=13000"}],"version-history":[{"count":105,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13000\/revisions"}],"predecessor-version":[{"id":37894,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13000\/revisions\/37894"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=13000"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=13000"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=13000"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}