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BIOLOGY Assertion & Reason

MODEL PAPER 5 · Rajasthan Board (RBSE) STD 11 Science (Rajasthan - 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): When $P_{c o_2}$ is high and $P_{o_2}$, is low as in the tissues, more binding of carbon dioxide occurs whereas, when the $P_{c o_2}$  is low and $P_{c o_2}$, is high as in the alveoli, dissociation of $CO _2$ from carbamino- hemoglobin takes place.
Reason (R):  $P_{c o_2}$, is a major factor that could affect the binding of $CO _2$ with hemoglobin.
  • 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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MCQ 21 Mark
Assertion (A): Mushrooms are called fairy rings.
Reason (R): Mushroom consists of two parts-stipe and pileus.
  • 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: The basidiocarps or mushrooms often lie in rings. Therefore, these are also known as fairy rings. Each basidiocarp consists of two parts-stipe and pileus. The stipe or stalk is fleshy while, the pileus is an umbrella-like cap of the mushroom.
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MCQ 31 Mark
Assertion (A): In certain industries, especially those involving grinding or stone-breaking, so much dust is produced, a long exposure can give rise to occupational respiratory disorders.
Reason (R): It produces inflammation leading to fibrosis and thus causing serious lung damage.
  • 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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MCQ 41 Mark
Assertion (A): Natural rubbers are polyterpene.
Reason (R): Terpene is a lipid.
  • 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: Terpene are among the minor lipid components of cells. These are constructed of multiples of the 5-carbon hydrocarbon isoprene. Natural rubber is a polyterpene as it contains thousands of isoprene units arranged in linear fashion.
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