Biology MCQs

31. What is the enzyme that breaks down lactose?
[A] Lipase enzymes
[B] Pepsin
[C] Amylase
[D] Lactase

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32. Mendel used which of the following one for his experiments.
[A] Pisum sativum
[B] Pisum album
[C] Oryza sativa
[D] Oryza Orientalis

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33. Which of the following is a free-living aerobic and non-photosynthetic nitrogen-fixing bacterium?
[A] Rhizobium
[B] Nostoc
[C] Azospirillum
[D] Azotobacter

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34. Which of the following is an important objective of biotechnology in the field of agriculture?
[A] to decrease seed number
[B] to produce pest-resistant varieties of plants
[C] to increase phosphorous, nitrogen production
[D] to reduce the number of plants

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35. Epidermal cells of which part of plant often secrete a waxy water resistant layer on their outer surface?
[A] Aerial parts only
[B] Roots only
[C] Both aerial parts and roots
[D] Neither aerial parts nor roots

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36. In which one of the following is swim bladder absent?
[A] Cartilaginous fish
[B] Silverfish
[C] Cuttlefish
[D] Bony fish

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

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38. The cells of sclerenchyma tissue have their walls thickened due to which chemical substance?
[A] Cellulose
[B] Hemicellulose
[C] Lignin
[D] Pectin

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39. The plant from which cocoa and chocolate are obtained is a ___:
[A] Herb
[B] Shrub
[C] Small tree
[D] Very big tree

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40. Glucose is a type of ____:
[A] Hexose sugar
[B] Pentose sugar
[C] Tetrose sugar
[D] Diose sugar

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