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BIOLOGY Assertion & Reason

MODEL PAPER 6 · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 4 questions.

Questions

Assertion & Reason

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4 questions · self-marked practice — reveal the answer and mark yourself.

MCQ 11 Mark
Assertion (A): Balantidium coli lives in colon of human beings, only.
Reason (R): The association is harmless.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    Both A and R are false
Answer
(d) Both A and R are false.
Explanation: Balantidium coli is a ciliate protozoan parasite of colon and caecum of man, monkeys, pigs, etc. It causes Balantidial dysentery in these organism.
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MCQ 21 Mark
Assertion (A): In mammals, complex respiratory system has developed.
Reason (R): Mammalian skin is impermeable to gases.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Mammalian skin is impermeable so that water loss through it, is minimised. But mammals need far more oxygen to maintain their high metabolic rates than lower animals; so they need a more extensive respiratory surface. Thus a complex respiratory system has evolved in mammals to meet this need. The mammalian respiratory system consists of the nasal cavity, nasopharynx, larynx, trachea, bronchi, bronchiole and lungs.
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MCQ 31 Mark
Assertion (A): Lysozyme of tears is an example of endoenzymes.
Reason (R): Enzymes functional inside living cells are known as endoenzymes.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
(d) A is false but R is true.
Explanation: Enzymes that function outside the living cell are called exoenzymes. Lysozyme of tears is functional outside the living cells and is an example of exoenzymes. Examples of endoenzymes are trypsin, pepsin, lipase which work in our Intestinal tract
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MCQ 41 Mark
Assertion (A): Emphysema is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased.
Reason (R): One of the major causes of this is cigarette smoking.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.

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