{"id":12833,"date":"2025-09-24T04:19:17","date_gmt":"2025-09-24T03:19:17","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=12833"},"modified":"2026-01-12T08:25:15","modified_gmt":"2026-01-12T08:25:15","slug":"animal-kingdom-set-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/09\/24\/animal-kingdom-set-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Animal Kingdom Set 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. Which of the following characters is not a general feature of animals?<br><\/mark><\/strong>A) Multicellular<br>B) Autotrophic<br>C) Eukaryotic<br>D) Lack of cell wall<\/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>  Animals are heterotrophic; they depend on plants\/other organisms for food.\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 simplest multicellular animals belong to phylum __________.<br><\/mark><\/strong>A) Porifera<br>B) Cnidaria<br>C) Platyhelminthes<br>D) Protozoa<\/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>  Sponges (Porifera) are the simplest multicellular animals with cellular level of organization.\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. Sponges have _________.<br><\/mark><\/strong>A) Radial symmetry<br>B) Asymmetry<br>C) Bilateral symmetry<br>D) Biradial symmetry<\/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>  Sponges generally show asymmetry; some may have radial symmetry in larvae.\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. Choanocytes (collar cells) are characteristic of _________.<br><\/mark><\/strong>A) Cnidaria<br>B) Porifera<br>C) Platyhelminthes<br>D) Echinodermata<\/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>  Choanocytes help in water current and food capture in sponges.\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 phylum shows tissue level of organization for the first time?<br><\/mark><\/strong>A) Porifera<br>B) Cnidaria<br>C) Annelida<br>D) Arthropoda<\/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>  Cnidarians (Hydra, jellyfish) have tissue-level organization.\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. Cnidoblasts (stinging cells) are present in _________.<br><\/mark><\/strong>A) Porifera<br>B) Cnidaria<br>C) Mollusca<br>D) Platyhelminthes<\/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>  Specialized stinging cells for defense and prey capture.\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 phylum shows the first true body cavity (coelom)?<br><\/mark><\/strong>A) Platyhelminthes<br>B) Annelida<br>C) Nematoda<br>D) Mollusca<\/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>  Annelids are the first true coelomates (eucoelomates).\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. Flatworms belong to which phylum?<br><\/mark><\/strong>A) Platyhelminthes<br>B) Nematoda<br>C) Annelida<br>D) Arthropoda<\/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>  Flatworms include planaria, liver fluke, tapeworm.\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. Tapeworm is __________.<br><\/mark><\/strong>A) Endoparasite<br>B) Ectoparasite<br>C) Free-living<br>D) None<\/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>  Taenia solium lives inside human intestine.\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. Bilateral symmetry first appeared in __________.<br><\/mark><\/strong>A) Cnidaria<br>B) Porifera<br>C) Platyhelminthes<br>D) Echinodermata<\/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>  Flatworms are the first bilaterally symmetrical 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\">11. Which phylum shows acoelomate condition?<br><\/mark><\/strong>A) Platyhelminthes<br>B) Nematoda<br>C) Annelida<br>D) Arthropoda<\/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>  Flatworms lack a coelom \u2192 acoelomates.\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. Hydra belongs to phylum _________.<br><\/mark><\/strong>A) Porifera<br>B) Cnidaria<br>C) Annelida<br>D) Mollusca<\/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>   Hydra = freshwater cnidarian with tentacles and cnidoblasts.\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. Comb jellies belong to phylum ___________.<br><\/mark><\/strong>A) Porifera<br>B) Cnidaria<br>C) Ctenophora<br>D) Platyhelminthes<\/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>  Ctenophores are marine, with 8 comb plates of cilia.\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. Bioluminescence is seen in _________.<br><\/mark><\/strong>A) Hydra<br>B) Ctenophores<br>C) Sponges<br>D) Annelids<\/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>  Ctenophores (sea walnuts) show bioluminescence.\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. Flame cells are characteristic of __________.<br><\/mark><\/strong>A) Annelida<br>B) Platyhelminthes<br>C) Arthropoda<br>D) Mollusca<\/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>  Flame cells help in excretion and osmoregulation in flatworms.\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>16. Which cnidarian shows colonial form?<br><\/strong><\/mark>A) Hydra<br>B) Aurelia<br>C) Physalia<br>D) Planaria<\/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>  Physalia (Portuguese Man-of-War) is a colonial cnidarian.\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. Free-living flatworm is __________.<br><\/mark><\/strong>A) Planaria<br>B) Fasciola<br>C) Taenia<br>D) Schistosoma<\/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>  Planaria is non-parasitic, free-living flatworm.\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. Liver fluke (Fasciola hepatica) belongs to class __________.<br><\/mark><\/strong>A) Cestoda<br>B) Trematoda<br>C) Turbellaria<br>D) Monogenea<\/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>  Trematodes = parasitic flatworms (flukes).\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. Which cnidarian has both polyp and medusa stages?<br><\/mark><\/strong>A) Aurelia<br>B) Hydra<br>C) Physalia<br>D) Obelia<\/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>  Obelia shows alternation between polyp and medusa (metagenesis).\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. Symmetry in cnidarians is __________.<br><\/mark><\/strong>A) Radial<br>B) Bilateral<br>C) Asymmetry<br>D) Spherical<\/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>  Cnidarians are radially symmetrical.\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. Fertilization in sponges is ___________.<br><\/mark><\/strong>A) External<br>B) Internal<br>C) Both<br>D) None<\/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>  Sponges release sperms into water, fertilization occurs inside body.\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. Body cavity lined by mesoderm is _________.<br><\/mark><\/strong>A) Pseudocoelom<br>B) Coelom<br>C) Acoelom<br>D) Haemocoel<\/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>   True coelom lined by mesoderm \u2192 found in annelids onward.\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. Animals lacking body cavity are ___________.<br><\/mark><\/strong>A) Acoelomates<br>B) Pseudocoelomates<br>C) Coelomates<br>D) Diploblasts<\/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>   Example: Platyhelminthes.\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 diploblastic?<br><\/mark><\/strong>A) Hydra<br>B) Planaria<br>C) Earthworm<br>D) Insect<\/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>  Cnidarians (Hydra) have two germ layers (ectoderm + endoderm).\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 animal is triploblastic?<br><\/mark><\/strong>A) Sponges<br>B) Hydra<br>C) Tapeworm<br>D) Amoeba<\/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>  From Platyhelminthes onward, animals are triploblastic.\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 body cavity of roundworms (Ascaris) is ___________.<br><\/mark><\/strong>A) Acoelomate<br>B) Pseudocoelomate<br>C) Coelomate<br>D) Haemocoel<\/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>  Nematodes have pseudocoelom \u2192 not fully lined by mesoderm.\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. Excretory organs of annelids are __________.<br><\/mark><\/strong>A) Flame cells<br>B) Nephridia<br>C) Malpighian tubules<br>D) Kidneys<\/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>  Annelids (earthworm) excrete via nephridia.\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 circulatory system of earthworm is ______________.<br><\/mark><\/strong>A) Open type<br>B) Closed type<br>C) Absent<br>D) Lymphatic<\/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>  Earthworm has a closed circulatory system with blood vessels.\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. Body of annelids is __________.<br><\/mark><\/strong>A) Segmented externally only<br>B) Segmented internally only<br>C) Segmented both externally &amp; internally<br>D) Unsegmented<\/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>  Metameric segmentation is a feature of annelids.\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. Roundworms are placed under phylum ____________.<br><\/mark><\/strong>A) Platyhelminthes<br>B) Nematoda<br>C) Annelida<br>D) Mollusca<\/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>  Roundworms (Ascaris, Wuchereria) belong to phylum Nematoda.\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. Elephantiasis is caused by ________.<br><\/mark><\/strong>A) Taenia solium<br>B) Fasciola hepatica<br>C) Wuchereria bancrofti<br>D) Planaria<\/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>  Filariasis\/elephantiasis is caused by filarial worm Wuchereria.\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. Earthworm belongs to class _________.<br><\/mark><\/strong>A) Polychaeta<br>B) Hirudinea<br>C) Oligochaeta<br>D) Nematoda<\/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>   Earthworm \u2192 subclass Oligochaeta of phylum Annelida.\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. Leeches belong to _________.<br><\/mark><\/strong>A) Hirudinea<br>B) Oligochaeta<br>C) Polychaeta<br>D) Nematoda<\/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>   Leeches are blood-sucking annelids \u2192 class Hirudinea.\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 largest phylum of Animal Kingdom is  _________.<br><\/mark><\/strong>A) Annelida<br>B) Arthropoda<br>C) Mollusca<br>D) Echinodermata<\/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>  Arthropoda includes insects, crustaceans, arachnids \u2192 ~80% of known 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\">35. Respiratory organs in prawn are __________.<br><\/mark><\/strong>A) Tracheae<br>B) Book lungs<br>C) Gills<br>D) Skin<\/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>  Crustaceans like prawns respire through gills.\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. Excretory organs of insects are __________.<br><\/mark><\/strong>A) Kidneys<br>B) Flame cells<br>C) Malpighian tubules<br>D) Nephridia<\/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>  Insects excrete nitrogenous wastes through Malpighian tubules.\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. Blood of cockroach is __________.<br><\/mark><\/strong>A) Red with hemoglobin<br>B) Blue with hemocyanin<br>C) Colorless without hemoglobin<br>D) Green<\/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>   Cockroach has colorless haemolymph; oxygen is carried via tracheae, not blood.\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. Circulatory system of arthropods is __________.<br><\/mark><\/strong>A) Closed<br>B) Open<br>C) Absent<br>D) Lymphatic<\/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>  Arthropods (cockroach, prawn) have open circulation with haemocoel.\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. Which of the following is NOT an arthropod?<br><\/mark><\/strong>A) Prawn<br>B) Spider<br>C) Earthworm<br>D) Scorpion<\/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>  Earthworm is annelid, not arthropod.\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. Radula is a rasping organ in __________.<br><\/mark><\/strong>A) Annelida<br>B) Mollusca<br>C) Arthropoda<br>D) Echinodermata<\/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>   Radula \u2192 toothed tongue-like organ for scraping food in mollusks.\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. Octopus belongs to class __________.<br><\/mark><\/strong>A) Pelecypoda<br>B) Cephalopoda<br>C) Gastropoda<br>D) Amphibia<\/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>  Octopus = highly intelligent cephalopod mollusk.\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. Largest invertebrate is __________.<br><\/mark><\/strong>A) Octopus<br>B) Squid (Architeuthis)<br>C) Starfish<br>D) Prawn<\/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>  Giant squid is the largest invertebrate, up to 18 m long.\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. Water vascular system is characteristic of __________.<br><\/mark><\/strong>A) Mollusca<br>B) Arthropoda<br>C) Echinodermata<br>D) Annelida<\/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>  Starfish, sea urchins use water vascular system for locomotion &#038; food capture.\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. Symmetry of echinoderms is ___________.<br><\/mark><\/strong>A) Radial in adults, bilateral in larvae<br>B) Bilateral in adults, radial in larvae<br>C) Only radial<br>D) Only bilateral<\/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>  Echinoderm larvae \u2192 bilateral; adults \u2192 pentamerous radial symmetry.\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. Endoskeleton of echinoderms is made up of ___________.<br><\/mark><\/strong>A) Chitin<br>B) Silica<br>C) Calcium carbonate<br>D) Keratin<\/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>  Echinoderms have calcareous endoskeleton of ossicles.\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. Starfish belongs to phylum ____________.<br><\/mark><\/strong>A) Mollusca<br>B) Echinodermata<br>C) Annelida<br>D) Arthropoda<\/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>   Starfish = echinoderm with water vascular 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\">47. Which phylum shows pentamerous radial symmetry?<br><\/mark><\/strong>A) Cnidaria<br>B) Arthropoda<br>C) Echinodermata<br>D) Mollusca<\/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>  Adult echinoderms show pentaradial symmetry.\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 animal has book lungs?<br><\/mark><\/strong>A) Prawn<br>B) Spider<br>C) Cockroach<br>D) Earthworm<\/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>  Arachnids (spiders, scorpions) respire through book 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\">49. Pearls are formed in __________.<br><\/mark><\/strong>A) Snail<br>B) Octopus<br>C) Oyster<br>D) Starfish<\/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>  Pearls are secreted by mantle of pearl oyster (Pinctada).\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. Which phylum shows true coelom, bilateral symmetry, and segmented body?<br><\/mark><\/strong>A) Annelida<br>B) Nematoda<br>C) Arthropoda<br>D) Mollusca<\/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>  Earthworm (annelid) \u2192 first true coelomates with metamerism.\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 defining character of chordates is __________.<br><\/mark><\/strong>A) Notochord<br>B) Backbone<br>C) Paired fins<br>D) Hair<\/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>  All chordates have notochord at some stage in life, though in vertebrates it is replaced by vertebral column.\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 is not a chordate character?<br><\/mark><\/strong>A) Dorsal hollow nerve cord<br>B) Ventral solid nerve cord<br>C) Pharyngeal gill slits<br>D) Post-anal tail<\/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>  Chordates have a dorsal hollow nerve cord; ventral solid nerve cord is seen in non-chordates.\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 subphylum includes all vertebrates?<br><\/mark><\/strong>A) Urochordata<br>B) Cephalochordata<br>C) Vertebrata<br>D) Hemichordata<\/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>  Vertebrates = chordates with cranium and vertebral column.\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. Cyclostomes (lampreys &amp; hagfish) are __________.<br><\/mark><\/strong>A) Jawed vertebrates<br>B) Jawless vertebrates<br>C) Cartilaginous fishes<br>D) Amphibians<\/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>   Cyclostomes are agnathans (jawless vertebrates), e.g., Petromyzon.\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. Heart of fishes is _________.<br><\/mark><\/strong>A) 2-chambered<br>B) 3-chambered<br>C) 4-chambered<br>D) Variable<\/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>  Fish heart has 1 atrium + 1 ventricle, single circulation.\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. Fishes respire mainly through _________.<br><\/mark><\/strong>A) Lungs<br>B) Gills<br>C) Skin<br>D) Tracheae<\/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>  Gills extract dissolved oxygen from 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\">57. Which group of fishes has a cartilaginous skeleton?<br><\/mark><\/strong>A) Osteichthyes<br>B) Cyclostomes<br>C) Chondrichthyes<br>D) Amphibia<\/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>  Sharks, rays (Chondrichthyes) have cartilage skeleton.\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 are bony fishes?<br><\/mark><\/strong>A) Shark<br>B) Dogfish<br>C) Rohu and Catla<br>D) Sting ray<\/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>  Bony fishes (Osteichthyes) include Rohu, Catla, tuna.\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. The first land vertebrates are  _________.<br><\/mark><\/strong>A) Amphibians<br>B) Reptiles<br>C) Mammals<br>D) Birds<\/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>  Amphibians were the first chordates to adapt to land but still depend on water for reproduction.\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. Heart of amphibians is __________.<br><\/mark><\/strong>A) 2-chambered<br>B) 3-chambered<br>C) 4-chambered<br>D) 5-chambered<\/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>  Amphibian heart has 2 atria + 1 ventricle \u2192 incomplete separation.\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. Respiration in frog occurs through ___________.<br><\/mark><\/strong>A) Only lungs<br>B) Only skin<br>C) Only gills<br>D) Lungs, skin, and gills (larvae)<\/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>  Adult frog \u2192 lungs + skin; tadpole \u2192 gills.\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. Reptiles are called first true land vertebrates because ____________.<br><\/mark><\/strong>A) They have lungs<br>B) They are cold-blooded<br>C) They lay cleidoic (shelled) eggs on land<br>D) They have 3-chambered heart<\/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>  Reptiles are independent of water for reproduction due to shelled eggs.\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. Crocodiles differ from other reptiles in having ___________.<br><\/mark><\/strong>A) 2-chambered heart<br>B) 3-chambered heart<br>C) 4-chambered heart<br>D) No heart<\/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>  Crocodiles \u2192 only reptiles with a completely 4-chambered heart.\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 exoskeleton of reptiles is made of ____________.<br><\/mark><\/strong>A) Chitin<br>B) Keratinized scales<br>C) Calcium carbonate<br>D) Cartilage<\/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>  Reptiles are covered with dry, keratinized scales \u2192 prevent 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\">65. Which reptile is limbless?<br><\/mark><\/strong>A) Turtle<br>B) Crocodile<br>C) Snake<br>D) Lizard<\/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>   Snakes evolved limblessness for burrowing and locomotion.\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. Birds belong to class _________.<br><\/mark><\/strong>A) Reptilia<br>B) Aves<br>C) Amphibia<br>D) Mammalia<\/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>   Birds form class Aves in phylum Chordata.\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. Which modification is characteristic of birds?<br><\/mark><\/strong>A) Pneumatic (hollow) bones<br>B) Lungs with air sacs<br>C) Forelimbs modified as wings<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 for flight in 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\">68. Birds are __________.<br><\/mark><\/strong>A) Poikilothermic (cold-blooded)<br>B) Homeothermic (warm-blooded)<br>C) Variable temperature animals<br>D) None<\/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>  Birds maintain constant body temperature.\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. Heart of birds is  _______.<br><\/mark><\/strong>A) 2-chambered<br>B) 3-chambered<br>C) 4-chambered<br>D) 5-chambered<\/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>  Birds have completely separated systemic &#038; pulmonary circulation.\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. Birds are toothless but have ____________.<br><\/mark><\/strong>A) Beak<br>B) Horns<br>C) Tongue<br>D) Radula<\/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>  Birds \u2192 beaks adapted to feeding habits, no teeth.\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. Mammals are characterized by  ___________.<br><\/mark><\/strong>A) Hair on body<br>B) Mammary glands<br>C) Presence of diaphragm<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 unique mammalian features.\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. Heart of mammals is _________.<br><\/mark><\/strong>A) 2-chambered<br>B) 3-chambered<br>C) 4-chambered<br>D) 5-chambered<\/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>  Mammals have complete separation of oxygenated and deoxygenated blood.\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. Fertilization in mammals is ___________.<br><\/mark><\/strong>A) External<br>B) Internal<br>C) Both<br>D) None<\/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>  Fertilization and development are internal in mammals (except monotremes lay eggs).\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 mammal lays eggs?<br><\/mark><\/strong>A) Kangaroo<br>B) Platypus<br>C) Whale<br>D) Lion<\/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>  Monotremes (Platypus, Echidna) are egg-laying mammals.\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. Which mammal is aquatic and has flippers?<br><\/mark><\/strong>A) Bat<br>B) Whale<br>C) Elephant<br>D) Tiger<\/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>  Cetaceans (whales, dolphins) are fully aquatic mammals with flippers.\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. Animals with body temperature independent of environment are called ___________.<br><\/mark><\/strong>A) Poikilotherms<br>B) Homeotherms<br>C) Cold-blooded<br>D) None<\/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>  Homeotherms (birds, mammals) maintain constant internal temperature.\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>77. Which of the following is a poikilothermic animal?<br><\/strong><\/mark>A) Bird<br>B) Mammal<br>C) Frog<br>D) Human<\/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>   Amphibians, reptiles, fishes are poikilotherms (cold-blooded).\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 group has a 3-chambered heart usually?<br><\/mark><\/strong>A) Amphibians<br>B) Birds<br>C) Mammals<br>D) Fishes<\/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>  Amphibians \u2192 2 atria + 1 ventricle \u2192 3-chambered heart.\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. Which group has both 3- and 4-chambered hearts?<br><\/mark><\/strong>A) Reptiles<br>B) Birds<br>C) Mammals<br>D) Amphibians<\/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 reptiles \u2192 3-chambered; crocodiles \u2192 4-chambered.\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. Air bladder is present in ____________.<br><\/mark><\/strong>A) Cartilaginous fishes<br>b) Bony fishes<br>C) Amphibians<br>D) Mammals<\/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 bladder in Osteichthyes helps in buoyancy.\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 animal respires through skin?<br><\/mark><\/strong>A) Fish<br>B) Frog<br>C) Bird<br>D) Snake<\/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>  Amphibians like frog breathe through skin (cutaneous respiration).\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. Metamorphosis is absent in ____________.<br><\/mark><\/strong>A) Frog<br>B) Butterfly<br>C) Cockroach<br>D) Pigeon<\/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>  Birds and mammals develop directly, without metamorphosis.\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 animal shows metamorphosis?<br><\/mark><\/strong>A) Earthworm<br>B) Cockroach<br>C) Starfish<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>  Insects (cockroach, butterfly) and echinoderms (starfish) show metamorphosis.\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. Which animal is called \u201cflying mammal\u201d?<br><\/mark><\/strong>A) Whale<br>B) Bat<br>C) Kangaroo<br>D) Platypus<\/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>   Bats are true flying mammals (Chiroptera).\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. Which animal is called \u201cship of the desert\u201d?<br><\/mark><\/strong>A) Horse<br>B) Camel<br>C) Donkey<br>D) Yak<\/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>  Camels adapted for deserts; store fat in hump, tolerate 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\">86. Which mammal is egg-laying?<br><\/mark><\/strong>A) Kangaroo<br>B) Whale<br>C) Platypus<br>D) Tiger<\/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>  Monotremes (platypus, echidna) lay eggs.\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>87. Marsupials are mammals that ___________.<br><\/strong><\/mark>A) Lay eggs<br>B) Have pouches for young<br>C) Live in water<br>D) Are toothless<\/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>  Kangaroo, Koala are marsupials with abdominal pouches.\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. Which is the largest living bird?<br><\/mark><\/strong>A) Emu<br>B) Ostrich<br>C) Kiwi<br>D) Eagle<\/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>  Ostrich (Struthio) is the largest bird, up to 2.7 m tall.\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 is the smallest bird?<br><\/mark><\/strong>A) Sparrow<br>B) Sunbird<br>C) Hummingbird<br>D) Crow<\/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>  Hummingbird (~5 cm) is the smallest bird.\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 mammal has no vocal cords?<br><\/mark><\/strong>A) Whale<br>B) Dolphin<br>C) Giraffe<br>D) Elephant<\/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>  Giraffes are nearly voiceless as they lack developed vocal cords.\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. Which mammal is aquatic but breathes air?<br><\/mark><\/strong>A) Whale<br>B) Shark<br>C) Octopus<br>D) Dolphin<\/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>   Whales are mammals with lungs, not gills, so they breathe 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\">92. Which of the following is a viviparous animal?<br><\/mark><\/strong>A) Fish (shark)<br>B) Frog<br>C) Cow<br>D) Hen<\/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>   Viviparous \u2192 give birth to young; cow is viviparous mammal.\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. Oviparous animals include ____________.<br><\/mark><\/strong>A) Birds<br>B) Amphibians<br>C) Reptiles<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>  Oviparous \u2192 lay eggs \u2192 birds, amphibians, reptiles.\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 animal has the largest brain-to-body ratio?<br><\/mark><\/strong>A) Elephant<br>B) Dolphin<br>C) Human<br>D) Whale<\/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>   Humans have the highest brain-to-body ratio.\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 animal is known as \u201cliving fossil\u201d?<br><\/mark><\/strong>A) Coelacanth fish<br>B) Crocodile<br>C) Duck-billed Platypus<br>D) Kangaroo<\/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>  Coelacanth, a lobe-finned fish, considered living fossil.\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 phylum shows regeneration in adults?<br><\/mark><\/strong>A) Arthropoda<br>B) Mollusca<br>C) Echinodermata<br>D) Annelida<\/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>  Starfish regenerate arms; echinoderms show high regeneration power.\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. Which vertebrate group has both aquatic and terrestrial members?<br><\/mark><\/strong>A) Reptiles<br>B) Amphibians<br>C) Mammals<br>D) Birds<\/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>  Amphibians (frogs, salamanders) live both on land and 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\">98. Which reptile is considered a \u201cliving fossil\u201d?<br><\/mark><\/strong>A) Turtle<br>B) Crocodile<br>C) Tuatara (Sphenodon)<br>D) Lizard<\/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>  Tuatara of New Zealand is the only surviving member of order Rhynchocephalia.\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 mammal can fly?<br><\/mark><\/strong>A) Bat<br>B) Flying squirrel<br>C) Kangaroo<br>D) Whale<\/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>   Bat is the only true flying mammal; flying squirrels only glide.\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 statements about Animal Kingdom is true?<br><\/mark><\/strong>A) All vertebrates are chordates, but not all chordates are vertebrates<br>B) All chordates are vertebrates<br>C) All invertebrates are acoelomates<br>D) All non-chordates are radially symmetrical<\/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>  Urochordata and Cephalochordata are chordates but not vertebrates.\n <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1. Which of the following characters is not a general feature of animals?A) MulticellularB) AutotrophicC) EukaryoticD) Lack of cell wall Show Answer Answer: B Explanation: Animals are heterotrophic; they depend on plants\/other organisms for food. 2. The simplest multicellular animals belong to phylum __________.A) PoriferaB) CnidariaC) PlatyhelminthesD) Protozoa Show Answer Answer: A Explanation: Sponges (Porifera)<\/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":[16194,16184,16177,10984,16189,16185,16187,16151,16133,16155,16154,16147,16158,16139,16190,16195,16188,16182,16135,16196,16197,16180,16183,4029,16156,5649,5652,5623,16186,16181,16179,16193,16178,16134,16192,16132,16140,16191],"class_list":{"0":"post-12833","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-biology","7":"tag-amphibians","8":"tag-animal-characteristics","9":"tag-animal-kingdom","10":"tag-animal-kingdom-set-top-100-mcqs-with-answer-and-explanation","11":"tag-animal-structure-and-function","12":"tag-annelida","13":"tag-arthropoda","14":"tag-biology-learning","15":"tag-biology-mcqs","16":"tag-biology-preparation-material","17":"tag-biology-questions-and-answers","18":"tag-biology-quiz","19":"tag-biology-revision","20":"tag-biology-study-material","21":"tag-birds","22":"tag-chordata","23":"tag-classification-of-animals","24":"tag-coelenterata","25":"tag-competitive-exam-biology","26":"tag-echinodermata","27":"tag-fishes","28":"tag-invertebrates","29":"tag-mammals","30":"tag-mcqs-adda","31":"tag-mcqs-for-biology-exam","32":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","33":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-examsin-kannada","34":"tag-mcqs-for-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","35":"tag-mollusca","36":"tag-nematoda","37":"tag-phylum-classification","38":"tag-platyhelminthes","39":"tag-porifera","40":"tag-psc-biology-mcqs","41":"tag-reptiles","42":"tag-ssc-biology-mcqs","43":"tag-upsc-biology-mcqs","44":"tag-vertebrates"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12833","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=12833"}],"version-history":[{"count":102,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12833\/revisions"}],"predecessor-version":[{"id":35492,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12833\/revisions\/35492"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=12833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=12833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=12833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}