{"id":13641,"date":"2025-10-04T05:41:41","date_gmt":"2025-10-04T04:41:41","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=13641"},"modified":"2026-02-14T05:41:36","modified_gmt":"2026-02-14T05:41:36","slug":"biosphere-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/10\/04\/biosphere-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Biosphere 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 biosphere refers to<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) The layer of gases surrounding the Earth<br>B) The totality of life and life-supporting zones on Earth<br>C) The Earth\u2019s outer crust<br>D) The hydrological cycle<\/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>  Biosphere includes all organisms and the parts of the lithosphere, atmosphere, and hydrosphere where life exists.\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. Which is considered the &#8220;largest ecosystem&#8221;?<\/mark><\/strong><br>A) Forest<br>B) Desert<br>C) Ocean<br>D) Grassland<\/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>  Oceans cover about 71% of the Earth\u2019s surface and are the largest ecosystem supporting diverse life forms.\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. The upper limit of the biosphere is restricted 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) Availability of oxygen<br>B) Availability of water<br>C) Availability of sunlight<br>D) Temperature and radiation<\/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>  Life is absent beyond ~10 km above sea level due to low temperature and high UV radiation.\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. Which of the following is not a biotic component?<\/mark><\/strong><br>A) Plants<br>B) Animals<br>C) Microorganisms<br>D) Soil minerals<\/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>  Soil minerals are abiotic; plants, animals, and microbes are biotic.\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. Which of the following terms describes the functional role of an organism in an ecosystem?<\/mark><\/strong><br>A) Habitat<br>B) Niche<br>C) Community<br>D) Biome<\/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>  Niche refers to the role and function of a species in its ecosystem.\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 natural place of an organism or community is called<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) Habitat<br>B) Ecosystem<br>C) Ecotone<br>D) Biome<\/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>  Habitat is the physical environment where an organism lives.\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. The boundary where two ecosystems meet and integrate is called<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) Ecotone<br>B) Niche<br>C) Biome<br>D) Biosphere<\/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>   Ecotone is a transitional zone with species from both ecosystems, often highly productive.\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. Which of the following is an abiotic factor?<\/mark><\/strong><br>A) Decomposers<br>B) Climate<br>C) Herbivores<br>D) Carnivores<\/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>  Climate is non-living (abiotic), while others are biotic.\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. The grassland ecosystem of Africa is known as<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) Pampas<br>B) Velds<br>C) Steppes<br>D) Savanna<\/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>  African tropical grasslands are called Savannas.\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. Which biome is characterized by permafrost?<\/mark><\/strong><br>A) Desert<br>B) Tundra<br>C) Taiga<br>D) Savanna<\/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>  Tundra has permanently frozen subsoil called permafrost.\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. The \u201clungs of the Earth\u201d are<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) Taiga forests<br>B) Amazon rainforest<br>C) Coral reefs<br>D) Savannas<\/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>  Amazon rainforest produces ~20% of Earth\u2019s oxygen, hence called Earth\u2019s lungs.\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. Which of the following is a producer in an ecosystem?<\/mark><\/strong><br>A) Fungi<br>B) Bacteria<br>C) Green plants<br>D) Vultures<\/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>  Green plants synthesize food via photosynthesis, acting as producers.\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 transfer of energy from producers to herbivores to carnivores is called<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) Food web<br>B) Ecological pyramid<br>C) Food chain<br>D) Trophic cycle<\/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 chain shows linear energy transfer among organisms.\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. In the energy flow of ecosystems, the maximum energy is found at<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) Producers<br>B) Primary consumers<br>C) Secondary consumers<br>D) Tertiary consumers<\/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>   Producers capture solar energy and form the base of the food chain.\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. Pyramid of numbers in a grassland ecosystem is<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) Inverted<br>B) Upright<br>C) Spindle-shaped<br>D) Irregular<\/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>   Producers are more numerous than herbivores, which are more than carnivores.\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. Which nutrient cycle does not have an atmospheric component?<\/mark><\/strong><br>A) Nitrogen cycle<br>B) Carbon cycle<br>C) Phosphorus cycle<br>D) Oxygen cycle<\/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>  Phosphorus mainly cycles through rocks, soil, and organisms, not atmosphere.\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. The concept of \u201cecological niche\u201d was first introduced 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) Charles Darwin<br>B) G.E. Hutchinson<br>C) Grinnell<br>D) Odum<\/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>  Joseph Grinnell (1917) first defined the concept of niche.\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. Which of the following is a keystone species?<\/mark><\/strong><br>A) Tiger in a forest<br>B) Elephant in a grassland<br>C) Lion in a savanna<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>  Keystone species regulate ecosystem balance; their removal causes collapse.\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 study of interactions between organisms and environment is called<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) Ecology<br>B) Biology<br>C) Environment Science<br>D) Geology<\/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>  Ecology is the branch of science studying organism\u2013environment interactions.\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. Which of the following is an example of an ecotone?<\/mark><\/strong><br>A) Mangrove forests<br>B) Desert<br>C) Ocean<br>D) Grassland<\/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>  Mangroves occur at the junction of land and sea, hence ecotone.\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 zone of transition between two ecosystems is usually<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) Less diverse<br>B) More diverse and productive<br>C) Having no organisms<br>D) Identical to the larger ecosystem<\/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>  Ecotone has high diversity due to presence of species from both ecosystems.\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. Which of the following biomes has the greatest biodiversity?<\/mark><\/strong><br>A) Desert<br>B) Tropical rainforest<br>C) Tundra<br>D) Taiga<\/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>  Tropical rainforests have highest species diversity due to favorable conditions.\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. The term \u201cBiomagnification\u201d refers to<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) Increase in population of organisms<br>B) Increase in size of organisms<br>C) Increase in concentration of pollutants in higher trophic levels<br>D) Increase in biodiversity<\/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>  Biomagnification is accumulation of toxins (e.g., DDT) in food chains.\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. Which is the largest carbon reservoir on Earth?<\/mark><\/strong><br>A) Atmosphere<br>B) Forests<br>C) Oceans<br>D) Fossil fuels<\/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>  Oceans store maximum carbon in dissolved form.\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. Which ecosystem has the highest productivity?<\/mark><\/strong><br>A) Desert<br>B) Grassland<br>C) Estuary<br>D) Tundra<\/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>  Estuaries are highly productive ecosystems due to nutrient-rich waters.\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. Which of the following is the study of distribution of organisms on Earth?<\/mark><\/strong><br>A) Ecology<br>B) Taxonomy<br>C) Biogeography<br>D) Paleontology<\/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>  Biogeography deals with spatial and temporal distribution of plants and animals.\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. Who introduced the term &#8220;ecosystem&#8221;?<\/mark><\/strong><br>A) Ernst Haeckel<br>B) A.G. Tansley<br>C) Odum<br>D) Darwin<\/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 1935, A.G. Tansley coined the term \u201cecosystem\u201d to describe the interaction of organisms with their environment.\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. The largest terrestrial biome on Earth is<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) Tropical rainforest<br>B) Taiga (Boreal forest)<br>C) Savanna<br>D) Desert<\/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>  Taiga, also known as boreal forest, covers vast areas of North America, Europe, and Asia.\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. Which of the following is not a greenhouse gas?<\/mark><\/strong><br>A) CO\u2082<br>B) CH\u2084<br>C) O\u2083<br>D) O\u2082<\/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>  Oxygen does not trap heat, unlike CO\u2082, methane, and ozone.\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. In ecological succession, the first species to colonize an area are called<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) Primary consumers<br>B) Climax species<br>C) Pioneer species<br>D) Secondary species<\/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>  Pioneer species (like lichens, mosses) begin colonization in bare or new areas.\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 climax community in tropical regions is usually<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) Grassland<br>B) Desert shrubs<br>C) Rainforest<br>D) Tundra<\/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 humid tropical climates, succession culminates in dense rainforests.\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. Which of the following ecosystems is least productive?<\/mark><\/strong><br>A) Coral reefs<br>B) Tundra<br>C) Tropical rainforest<br>D) Estuary<\/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>  Due to low temperature and short growing season, tundra has least productivity.\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 natural vegetation of Mediterranean climate is called<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) Taiga<br>B) Chaparral<br>C) Savanna<br>D) Prairie<\/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>  Mediterranean scrub vegetation is known as chaparral, dominated by shrubs.\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. Coral reefs are found in<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) Cold polar waters<br>B) Warm shallow tropical seas<br>C) Deep oceans<br>D) Freshwater lakes<\/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>  Corals need sunlight and warm saline water to thrive.\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. The main source of energy in an ecosystem is<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) Plants<br>B) Sun<br>C) Soil<br>D) Decomposers<\/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>  Solar energy is the primary source, captured by producers.\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 type of pyramid is always upright?<\/mark><\/strong><br>A) Pyramid of numbers<br>B) Pyramid of biomass<br>C) Pyramid of energy<br>D) Pyramid of productivity<\/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>  Energy decreases at each trophic level; hence, energy pyramid is always upright.\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. Biodiversity hotspots are rich in<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) Endemic species<br>B) Soil minerals<br>C) Fossil fuels<br>D) Exotic plants<\/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>  Hotspots are regions with high endemic species under threat.\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\">38. India is part of how many global biodiversity hotspots?<\/mark><\/strong><br>A) 2<br>B) 3<br>C) 4<br>D) 5<\/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>  India has 3 hotspots: Indo-Burma, Himalaya, and Indo-Malayan (Nicobar).\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 greatest threat to biodiversity is<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) Overgrazing<br>B) Habitat destruction<br>C) Hunting<br>D) Pollution<\/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>  Deforestation, urbanization, and agriculture lead to maximum biodiversity 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\">40. The pyramid of numbers in a forest ecosystem is<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) Upright<br>B) Inverted<br>C) Spindle-shaped<br>D) Irregular<\/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>  Few trees support many herbivores and even more insects, giving inverted shape.\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. Mangroves are found in<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) Tropical rainforests<br>B) Coastal tidal zones<br>C) High mountains<br>D) Grasslands<\/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>  Mangroves thrive in saline tidal waters of tropical coasts.\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. Which biome is known as the \u201cbreadbasket of the world\u201d?<\/mark><\/strong><br>A) Tundra<br>B) Taiga<br>C) Temperate grassland<br>D) Desert<\/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>  Fertile temperate grasslands (prairies, pampas, steppes) are ideal for agriculture.\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. In the nitrogen cycle, atmospheric nitrogen is fixed 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) Fungi<br>B) Bacteria<br>C) Plants<br>D) Animals<\/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>  Rhizobium and cyanobacteria convert nitrogen into usable forms.\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. Which biome has the lowest annual rainfall?<\/mark><\/strong><br>A) Desert<br>B) Grassland<br>C) Savanna<br>D) Taiga<\/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>  Deserts receive less than 25 cm rainfall annually.\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. Which of the following organisms is a decomposer?<\/mark><\/strong><br>A) Earthworm<br>B) Fungi<br>C) Lion<br>D) Goat<\/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>  Fungi decompose organic matter into nutrients.\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. Which is the richest biome in terms of species diversity?<\/mark><\/strong><br>A) Taiga<br>B) Tropical rainforest<br>C) Desert<br>D) Grassland<\/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>  Rainforests harbor more than half of Earth\u2019s plant and animal species.\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. The gradual change in species composition in an area is known as<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) Evolution<br>B) Mutation<br>C) Succession<br>D) Speciation<\/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>  Ecological succession is the natural replacement of communities over time.\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 of the following is not a renewable resource?<\/mark><\/strong><br>A) Forests<br>B) Water<br>C) Coal<br>D) Wildlife<\/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>  Coal takes millions of years to form; hence, it is non-renewable.\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. The Antarctic ecosystem is characterized 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) High productivity<br>B) Low biodiversity<br>C) Dense forests<br>D) Tropical vegetation<\/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>  Harsh climate limits species diversity in Antarctica.\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 zone of life on Earth is restricted to<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) 6 km above to 6 km below the surface<br>B) 20 km above to 5 km below<br>C) 10 km above to 10 km below<br>D) 15 km above to 5 km below<\/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>  The biosphere extends roughly 6 km above sea level (troposphere) to 6 km below (deep ocean).\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 area where freshwater and seawater mix is called<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) Lagoon<br>B) Estuary<br>C) Delta<br>D) Fjord<\/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>  Estuaries form at river mouths where freshwater mixes with saline seawater, creating highly productive ecosystems.\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. Which of the following ecosystems has the highest net primary productivity (NPP)?<\/mark><\/strong><br>A) Desert<br>B) Coral reef<br>C) Tundra<br>D) Savanna<\/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>  Coral reefs are highly productive ecosystems due to abundant sunlight and nutrient recycling.\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. Which gas is most important for photosynthesis in plants?<\/mark><\/strong><br>A) Oxygen<br>B) Nitrogen<br>C) Carbon dioxide<br>D) Methane<\/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>  Plants use CO\u2082 along with sunlight and water to make glucose 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\">54. Which of the following is an example of mutualism?<\/mark><\/strong><br>A) Lichen<br>B) Tapeworm in human intestine<br>C) Lion eating deer<br>D) Mosquito feeding on blood<\/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>  Lichen is a symbiotic association between algae (provides food) and fungi (provides shelter).\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. The concept of \u201cecological pyramid\u201d was given 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) Charles Elton<br>B) Darwin<br>C) E.P. Odum<br>D) Tansley<\/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>  Charles Elton (1927) proposed ecological pyramids to represent energy\/biomass\/number relationships.\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. Which of the following is an in-situ method of biodiversity conservation?<\/mark><\/strong><br>A) Zoological parks<br>B) Botanical gardens<br>C) Wildlife sanctuaries<br>D) Seed banks<\/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-situ conservation means protecting species in their natural habitats, like sanctuaries and national parks.\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. Which of the following is an ex-situ method of biodiversity conservation?<\/mark><\/strong><br>A) Biosphere reserves<br>B) National parks<br>C) Botanical gardens<br>D) Sacred groves<\/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>  Ex-situ conservation involves protecting species outside their natural habitat, e.g., zoos, seed banks, gardens.\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 of the following is a Ramsar site in India?<\/mark><\/strong><br>A) Loktak Lake<br>B) Vembanad Lake<br>C) Chilika Lake<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>  Loktak (Manipur), Vembanad (Kerala), and Chilika (Odisha) are Ramsar wetlands of international importance.\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 Indian biosphere reserve is part of UNESCO World Network of Biosphere Reserves?<\/mark><\/strong><br>A) Nilgiri<br>B) Nanda Devi<br>C) Sundarbans<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>  Nilgiri, Nanda Devi, and Sundarbans are UNESCO-recognized biosphere reserves.\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. The primary producers in an ocean ecosystem are<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) Fishes<br>B) Phytoplankton<br>C) Zooplankton<br>D) Seaweed 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>  Phytoplankton are microscopic plants that photosynthesize and form the base of oceanic food chains.\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. Which is the most abundant gas in the atmosphere?<\/mark><\/strong><br>A) Oxygen<br>B) Nitrogen<br>C) Carbon dioxide<br>D) Argon<\/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>  Nitrogen makes up 78% of the Earth\u2019s atmosphere.\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. Which forest type has the maximum biomass?<\/mark><\/strong><br>A) Tropical rainforests<br>B) Temperate grasslands<br>C) Coniferous forests<br>D) Mangroves<\/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>  Due to warm climate and heavy rainfall, tropical rainforests have highest biomass per unit area.\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. Which zone of a lake supports rooted vegetation?<\/mark><\/strong><br>A) Littoral zone<br>B) Limnetic zone<br>C) Profundal zone<br>D) Benthic zone<\/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>  The shallow littoral zone has enough light penetration for rooted 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\">64. The term \u201cGaia Hypothesis\u201d (Earth as a living system) 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) James Lovelock<br>B) Charles Darwin<br>C) Alfred Wallace<br>D) Odum<\/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>  Lovelock\u2019s Gaia hypothesis suggests Earth functions as a self-regulating living system.\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 main factor limiting plant growth in deserts is<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) High temperature<br>B) Low sunlight<br>C) Low water availability<br>D) Poor soil nutrients<\/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>  Scarcity of water is the primary limiting factor in desert plant growth.\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. Which of the following ecosystems is known as \u201ccradle of evolution\u201d?<\/mark><\/strong><br>A) Coral reefs<br>B) Tropical rainforest<br>C) Wetlands<br>D) Estuaries<\/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>  Coral reefs provide diverse niches and have high species richness, earning them the title \u201ccradle of evolution.\u201d\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. What is the main source of oxygen in the atmosphere?<\/mark><\/strong><br>A) Weathering of rocks<br>B) Photosynthesis<br>C) Volcanic activity<br>D) Fossil fuels<\/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>  Green plants and phytoplankton release oxygen as a by-product of 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\">68. Which of the following forests is also called &#8220;Taiga&#8221;?<\/mark><\/strong><br>A) Tropical rainforest<br>B) Coniferous forest<br>C) Temperate deciduous forest<br>D) Mangroves<\/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>  Taiga refers to coniferous forests of cold temperate regions.\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. Which is the largest terrestrial carbon sink?<\/mark><\/strong><br>A) Forests<br>B) Soil organic matter<br>C) Permafrost<br>D) Fossil fuels<\/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>  Forests act as major carbon sinks through photosynthesis and biomass storage.\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. Which of the following human activities increases desertification?<\/mark><\/strong><br>A) Overgrazing<br>B) Deforestation<br>C) Over-irrigation<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>  Overgrazing, deforestation, and excessive irrigation lead to land degradation and desertification.\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. Which ecosystem is called the \u201cecological supermarket\u201d?<\/mark><\/strong><br>A) Grassland<br>B) Estuary<br>C) Tropical rainforest<br>D) Savanna<\/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>  Estuaries are highly productive, providing food and nutrients for many species.\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. Which species concept focuses on reproductive isolation?<\/mark><\/strong><br>A) Ecological concept<br>B) Morphological concept<br>C) Biological concept<br>D) Evolutionary concept<\/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>  The biological species concept (Ernst Mayr) defines species by reproductive isolation.\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\">73. Which type of succession begins on a bare rock surface?<\/mark><\/strong><br>A) Primary succession<br>B) Secondary succession<br>C) Tertiary succession<br>D) Climax succession<\/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>  Primary succession begins in lifeless areas like bare rocks, with lichens and mosses as pioneers.\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. Which biome is characterized by trees shedding leaves in dry season?<\/mark><\/strong><br>A) Tropical deciduous forest<br>B) Temperate coniferous forest<br>C) Taiga<br>D) Tropical rainforest<\/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 forests shed leaves to conserve water during dry seasons.\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 \u201cedge effect\u201d (higher diversity at ecosystem boundaries) is most prominent in<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) Ecotones<br>B) Climax community<br>C) Desert<br>D) Tundra<\/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>  Ecotones show edge effect, with higher diversity and abundance than adjoining ecosystems.\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. Which of the following is a natural greenhouse gas?<\/mark><\/strong><br>A) Nitrous oxide (N\u2082O)<br>B) Methane (CH\u2084)<br>C) Carbon dioxide (CO\u2082)<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>  CO\u2082, CH\u2084, and N\u2082O are natural greenhouse gases responsible for trapping heat in the atmosphere.\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. Which biome is dominated by coniferous trees like pine, spruce, and fir?<\/mark><\/strong><br>A) Taiga<br>B) Tundra<br>C) Desert<br>D) Grassland<\/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>  The Taiga biome is dominated by cold-tolerant coniferous forests.\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 of the following is an endangered species found in India?<\/mark><\/strong><br>A) Asiatic Lion<br>B) Bengal Tiger<br>C) One-horned Rhinoceros<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>  Asiatic Lion, Bengal Tiger, and One-horned Rhino are endangered and protected under Indian wildlife laws.\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. The main function of ozone in the stratosphere is<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) To produce rainfall<br>B) To absorb harmful UV radiation<br>C) To increase Earth\u2019s temperature<br>D) To trap methane<\/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>  The ozone layer protects life by absorbing UV-B and UV-C radiation.\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. The \u201cBiotic potential\u201d of a species refers to<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) Maximum reproductive capacity under ideal conditions<br>B) Population decline due to limited resources<br>C) Carrying capacity of environment<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>  Biotic potential measures maximum growth rate of a species without limiting factors.\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. Which of the following is not a renewable resource?<\/mark><\/strong><br>A) Solar energy<br>B) Water<br>C) Petroleum<br>D) Forests<\/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>  Petroleum is non-renewable as it takes millions of years to form.\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 interaction in which one species benefits and the other is unaffected is called<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) Mutualism<br>B) Commensalism<br>C) Parasitism<br>D) Predation<\/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 commensalism, one species benefits while the other is neither harmed nor benefited.\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. In the food chain, herbivores are<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) Producers<br>B) Primary consumers<br>C) Secondary consumers<br>D) Decomposers<\/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>  Herbivores feed directly on producers (plants), making them primary consumers.\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 term \u201cbiodiversity hotspot\u201d was coined 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) Edward Wilson<br>B) Norman Myers<br>C) Alfred Wallace<br>D) Charles Darwin<\/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>  Norman Myers (1988) introduced the term \u201cbiodiversity hotspot\u201d for areas rich in endemic and threatened species.\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. The Sundarbans mangrove forest is famous for<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) Asiatic Lion<br>B) Royal Bengal Tiger<br>C) Snow Leopard<br>D) Great Indian Bustard<\/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>  Sundarbans is the world\u2019s largest mangrove forest, home to Bengal tigers.\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\">86. Which of the following cycles is a sedimentary cycle?<\/mark><\/strong><br>A) Nitrogen cycle<br>B) Carbon cycle<br>C) Phosphorus cycle<br>D) Oxygen cycle<\/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>  Phosphorus cycle is sedimentary, as it mainly involves soil and rock 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\">87. Which of the following is a desert adaptation in plants?<\/mark><\/strong><br>A) Thick cuticle<br>B) Sunken stomata<br>C) Deep roots<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>  Desert plants (xerophytes) adapt through cuticles, sunken stomata, and deep root systems.\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. The gradual decrease in energy through trophic levels is due to<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) Respiration<br>B) Heat loss<br>C) Metabolic processes<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>  At each trophic level, energy is lost as heat and through metabolism, reducing energy availability upwards.\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 Indian biosphere reserve is famous for \u201cfloating vegetation\u201d?<\/mark><\/strong><br>A) Nanda Devi<br>B) Loktak Lake<br>C) Sundarbans<br>D) Nilgiris<\/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>  Loktak Lake (Manipur) has floating biomass called Phumdis.\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. Which Indian sanctuary is known as the &#8220;Bird Watcher\u2019s Paradise&#8221;?<\/mark><\/strong><br>A) Bharatpur (Keoladeo)<br>B) Gir National Park<br>C) Kaziranga<br>D) Jim Corbett<\/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>  Keoladeo Ghana Bird Sanctuary in Rajasthan is famous for migratory birds.\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. The process of nutrient enrichment of water bodies leading to algal bloom is called<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) Salinization<br>B) Desertification<br>C) Eutrophication<br>D) Bioaccumulation<\/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>  Excess nutrients (nitrates, phosphates) cause algal blooms, depleting oxygen in 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\">92. Which biome is also called the \u201ccold desert\u201d?<\/mark><\/strong><br>A) Tundra<br>B) Taiga<br>C) Savanna<br>D) Grassland<\/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>  Tundra is known as \u201ccold desert\u201d due to low precipitation and extreme cold.\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 of the following is a non-point source of water pollution?<\/mark><\/strong><br>A) Industrial discharge<br>B) Sewage outfall<br>C) Agricultural runoff<br>D) Oil spill<\/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>  Non-point sources are diffuse and not easily traceable, like fertilizers from farms.\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. Which is the largest mangrove forest in the world?<\/mark><\/strong><br>A) Florida Everglades<br>B) Amazon delta<br>C) Sundarbans<br>D) Mekong delta<\/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>  Sundarbans in India and Bangladesh form the largest mangrove ecosystem.\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. The carrying capacity of an ecosystem refers to____________.<\/mark><\/strong><br>A) Maximum population that can be supported sustainably<br>B) Total biodiversity of the system<br>C) Net productivity of the system<br>D) Number of species present<\/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>  Carrying capacity is the maximum population size that environment can sustain.\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. Which Indian national park is famous for one-horned rhinoceros?<\/mark><\/strong><br>A) Gir<br>B) Kaziranga<br>C) Jim Corbett<br>D) Ranthambore<\/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>  Kaziranga National Park in Assam is home to the world\u2019s largest population of one-horned rhinoceros.\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\">97. The Great Barrier Reef is located in<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) Pacific Ocean<br>B) Atlantic Ocean<br>C) Indian Ocean<br>D) Arctic Ocean<\/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>  The Great Barrier Reef lies off the coast of Queensland, Australia, in the Pacific Ocean.\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. Which of the following is a primary pollutant?<\/mark><\/strong><br>A) Ozone<br>B) Peroxyacetyl nitrate (PAN)<br>C) Sulphur dioxide (SO\u2082)<br>D) Smog<\/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>  SO\u2082 is directly emitted from sources (primary), while ozone and PAN are secondary pollutants.\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 country hosts the largest area of tropical rainforest?<\/mark><\/strong><br>A) Indonesia<br>B) Brazil<br>C) Congo (DRC)<br>D) India<\/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>  Brazil contains the largest share of the Amazon rainforest.\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 of the following best describes the biosphere?<\/mark><\/strong><br>A) A thin zone of Earth where life exists<br>B) A single ecosystem<br>C) Only terrestrial life forms<br>D) Only aquatic life forms<\/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>   Biosphere is the global sum of ecosystems, comprising land, water, and air where life exists.\n <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1. The biosphere refers to____________.A) The layer of gases surrounding the EarthB) The totality of life and life-supporting zones on EarthC) The Earth\u2019s outer crustD) The hydrological cycle Show Answer Answer: B Explanation: Biosphere includes all organisms and the parts of the lithosphere, atmosphere, and hydrosphere where life exists. 2. Which is considered the &#8220;largest<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"[]"},"categories":[11121,14],"tags":[14494,14476,14498,14493,14503,14499,14490,14486,14487,14475,14497,14489,14485,14500,14477,14495,14502,14496,14484,14480,14481,11125,14478,14488,14474,14501,14479,14491,14492,4029,5649,5652,5623,14348,14449,14483],"class_list":{"0":"post-13641","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-physical-geography","7":"category-geography","8":"tag-biodiversity-mcqs","9":"tag-biomes-mcqs","10":"tag-biosphere-conservation-mcqs","11":"tag-biosphere-ecology-mcqs","12":"tag-biosphere-exam-preparation","13":"tag-biosphere-facts-and-figures","14":"tag-biosphere-for-competitive-exams","15":"tag-biosphere-geography-mcqs","16":"tag-biosphere-human-impact-mcqs","17":"tag-biosphere-important-questions","18":"tag-biosphere-important-terms","19":"tag-biosphere-learning-material","20":"tag-biosphere-objective-questions","21":"tag-biosphere-practice-questions","22":"tag-biosphere-questions-and-answers","23":"tag-biosphere-quiz","24":"tag-biosphere-revision-questions","25":"tag-biosphere-sample-questions","26":"tag-biosphere-study-material","27":"tag-biosphere-test-questions","28":"tag-biosphere-top-100-mcqs","29":"tag-biosphere-top-100-mcqs-with-answer-and-explanation","30":"tag-ecosystem-mcqs","31":"tag-energy-flow-in-ecosystem-mcqs","32":"tag-environmental-geography-mcqs","33":"tag-flora-and-fauna-mcqs","34":"tag-food-chain-and-food-web-mcqs","35":"tag-fully-optimized-for-exam-preparation-and-seo","36":"tag-i-can-also-expand-this-list-to-50-100-keyword-tags","37":"tag-mcqs-adda","38":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","39":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-examsin-kannada","40":"tag-mcqs-for-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","41":"tag-physical-geography-mcqs","42":"tag-physical-geography-objective-questions","43":"tag-population-and-community-mcqs"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13641","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=13641"}],"version-history":[{"count":103,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13641\/revisions"}],"predecessor-version":[{"id":48160,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/13641\/revisions\/48160"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=13641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=13641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=13641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}