Biology MCQs with answers Page - 10

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Q. Which one of the following constitute the fourth Trophic level of the food chain ?

  • (A) Autotrophs
  • (B) Carnivores
  • (C) Herbivores
  • (D) Omnivores

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Q. Internal ear is filled with

  • (A) lymph
  • (B) endolymph
  • (C) perilymph
  • (D) both (a ) and ( b)

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Q. Pepsin requires acidic medium for its optimal enzymatic activity. The cells of the gastric glands that secrete HCl are:
1.goblet cells
2.parietal cells
3.chief cells
4.oxyntic cells

  • (A) 2, 4
  • (B) 3, 4
  • (C) 2, 3
  • (D) 1, 2

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Q. A medicinal substance given against the intake of poisons or to prevent a disease from having an effect is known as

  • (A) antibiotic
  • (B) antibody
  • (C) antigen
  • (D) antidote

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Q. Plants absorb dissolved nitrates from soil and convert them into

  • (A) Free nitrogen
  • (B) Ammonia
  • (C) Urea
  • (D) Proteins

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Q. Human blood contains --- percentage of plasma.

  • (A) 40%
  • (B) 35%
  • (C) 50%
  • (D) 65%

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Q. Green plants evolve oxygen during the day rather than carbon dioxide. This means that:

  • (A) green plants respire during the day also but the rate of respiration is very low
  • (B) green plants respire only at night
  • (C) the rate of photosynthesis is much higher than the rate of respiration.
  • (D) green plants do not respire

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Q. Which of the following nitrogenous excretory products can be excreted in solid form?

  • (A) Urea
  • (B) Uric acid
  • (C) Ammonia
  • (D) Creatinine

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Q. The only movable bone in the skull is

  • (A) maxilla
  • (B) mandible
  • (C) nasal
  • (D) frontoparietal

A

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Q. Proteins differ from one another because

  • (A) The peptide bonds linking amino acids differ from protein to protein
  • (B) The sequence of amino acids in the polypeptide chain differs from protein to protein
  • (C) The number of nucleotides found in each protein varies from molecule to molecule
  • (D) Each protein contains its own unique sequence of sugar molecules

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