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BIOLOGY Assertion (A) & Reason (B) MCQ

MODEL PAPER 4 · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 4 questions.

Questions

Assertion (A) & Reason (B) MCQ

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

MCQ 11 Mark
Assertion (A): Large holes in Swiss cheese are due to the production of a large amount of carbon dioxide by specific microbe.
Reason (R): The specificity of characteristic texture, flavour and taste of Swiss cheese is due to the use of bacterium Propionibacterium shermanii.
  • A
    Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion.
  • B
    Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion.
  • C
    Assertion is true but Reason is false.
  • D
    Both Assertion and Reason are false.
Answer
(a) : Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion.
Explanation: Both Assertion and Reason are true, and Reason is the correct explanation of the Assertion.
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MCQ 21 Mark
Assertion (A): In India, there is rapid decline in infant mortality rate and MMR.
Reason (R): In India, more and more attention is being given to RCH programmes.
  • 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 31 Mark
Assertion (A): Evolution is a continuous process that takes millions of years for speciation.
Reason (R): During evolution, small variation accumulates guided by natural selection that leads to speciation.
  • 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: Evolution is a slow and continuous process that takes a long time to form a new species. Variation due to mutation, genetic drift, geographical isolation leads to speciation.
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MCQ 41 Mark
Assertion (A): Decomposition process is slower if detritus is rich in lignin and cutin.
Reason (R): Decomposition is largely an oxygen requiring process.
  • 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: Both (A) and (R) are true, but (R) is not the correct explanation of (A).
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