Biology MCQs

31. Which of the following is the largest group of mammals?
[A] Rodentia
[B] Chiroptera
[C] Carnivora
[D] Insectivora

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32. Langerhans cells are present in which of the following?
[A] Stratum Spinosum
[B] Stratum Basale
[C] Stratum Granulosum
[D] Stratum Corneum

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33. What is the unit of the Nervous system?
[A] Brain
[B] Spinal Cord
[C] Neuron
[D] Nerves

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34. The open space between bones is filled by which of the following?
[A] air
[B] blood
[C] bone cells
[D] bone marrow

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35. What are some of the common disorders caused by a poor immune system?
[A] Epidemic Diseases
[B] Deficiency diseases
[C] Autoimmune diseases
[D] None of the above

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36. Why is excretion a vital process in the human body?

  1. It helps to remove waste products from the body.
  2. It helps in maintaining the body’s internal environment by regulating chemical composition.
  3. It aids in the synthesis of crucial biomolecules.
  4. It generates energy by breaking down food substances.

Select the correct option from the codes given below:

[A] Only 1 & 2
[B] Only 2 & 3
[C] Only 1, 2 & 3
[D] 1, 2, 3 & 4

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37. Which of the following are the main sources of biofertilizers?
[A] bacteria
[B] cyanobacteria
[C] fungi
[D] All of the above

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38. Dumb-bell shaped guard cells are present in
____:
[A] Mango
[B] Wheat
[C] Gram
[D] Groundnut

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39. Which of the following bacterium causes crown gall disease in plants?
[A] Agrobacterium tumefaciens
[B] Pseudomonas fluorescens
[C] Bacillus thurigiensis
[D] None of the above

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40. The largest cells in mammalian blood are ____:
[A] Monocytes
[B] Lymphocytes
[C] Erythrocytes
[D] Basophils

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