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Biology Assertion (A) & Reason (B) MCQ

MODEL PAPER 5 · 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): Fossils are remains of dead organisms.
Reason (R): Palaeontology is helpful in study of evolution.
  • 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 fossils can be defined as remains or impressions of the hard parts of the past individuals in the strata of the earth. The study of fossils is known as palaeontology. The evidence of evolution based on the knowledge of fossils is called palaeontological evidence. It is possible, in many cases to arrange the fossils in a serial order which proves that evolution has taken place through the series. e.g. the fossil series of the horse.
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MCQ 21 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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MCQ 31 Mark
Assertion (A): Yeasts such as Saccharomyces cerevisiae are used in baking industry.
Reason (R): Carbon dioxide produced during fermentation causes bread dough to rise by thermal expansion.
  • 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: Yeast is a fermentation agent. It is a known fact that yeast raises bread dough to rise and hence, Yeast is also used to increase the volume, making the dough porous and the product soft. It is the yeast that helps the dough to rise.
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MCQ 41 Mark
Assertion (A): Test-tube baby has raised several legal problems.
Reason (R): It involves in vitro fertilization followed by embryo transfer.
  • 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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Assertion (A) & Reason (B) MCQ - Biology STD 12 Science Questions - Vidyadip