Biology MCQs

31. Which of the following structures are present in the throat to prevent the air passage from collapsing?
[A] Rings of cartilage
[B] Rings of muscle
[C] Rings of bone
[D] Rings of connective tissue

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32. Hydrochloric acid is secreted by the cells lining the
____:
[A] Stomach
[B] Ileum
[C] Oral cavity
[D] Colon

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33. The number of chambers in a human heart is
____:
[A] Two
[B] Three
[C] Four
[D] Five

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34. Azolla increases soil fertility for ____:
[A] Wheat cultivation
[B] Rice cultivation
[C] Maize cultivation
[D] Barley cultivation

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35. Biodegradable wastes can usually be converted into useful substances with the help of ____:
[A] Bacteria
[B] Viruses
[C] Nuclear proteins
[D] Radioactive substances

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36. Silk worms feed on
____:
[A] Basil leaves
[B] Mulberry leaves
[C] Curry leaves
[D] Rose leaves

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37. Leukaemia or blood cancer is characterised by abnormal in crease of the ____:
[A] Blood plasma
[B] Blood platelets
[C] Red blood cells
[D] White blood cells

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38. Which type of plants have weak stems and take support on neighbouring structures to climb up?
[A] Climbers
[B] Herbs
[C] Trees
[D] Shrubs

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39. Which of the following mammals lay eggs?
[A] Bat
[B] Whale
[C] Weasel
[D] Platypus

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40. What is the name of the hormone produced by thymus gland?
[A] Thyroxine
[B] Thymosin
[C] Cytokinins
[D] Auxins

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