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Biology Assertion (A) & Reason (B) MCQ

MODEL PAPER 1 · CBSE STD 12 Science (CBSE - English Medium). 4 questions.

Questions

Assertion (A) & Reason (B) MCQ

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4 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A): Homo sapiens have evolved from chimpanzee-like ancestors.
Reason (R): There is no difference between the two in the amino acid sequence of the protein Cytochrome-C.
  • A
    Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  • B
    Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  • C
    Assertion (A) is true, but Reason (R) is false.
  • D
    Assertion (A) is false, but Reason (R) is true.
Answer
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Explanation: Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
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MCQ 21 Mark
Assertion (A): Vertical distribution of different species occupying different levels in the ecosystem is called stratification.
Reason (R): Trees occupy top vertical strata or layer of a forest, herbs, grasses the second and shrubs occupy the bottom layers.
  • 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 is true but R is false.
Explanation: A is true but R is false.
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MCQ 31 Mark
Assertion (A): The primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and the air is pumped into it.
Reason (R): This allows vigorous growth of useful anaerobic microbes into flocs.
  • A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • C
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
Assertion is correct statement but reason is wrong statement.
Explanation: Assertion is correct statement but reason is wrong statement.
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MCQ 41 Mark
Assertion (A): Reproductive health means total well-being in all aspects of reproduction, i.e., physical, emotional, behavioural, and social.
Reason (R): A society with people having physically and functionally normal reproductive organs might be called reproductively healthy.
  • 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
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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Assertion (A) & Reason (B) MCQ - Biology STD 12 Science Questions - Vidyadip