Q1. [1] § 8.1 ACCUMULATION OF VARIATION DURING REPRODUCTION
Assertion (A) : Bacteria that can withstand heat have better chances of survival in a heat wave.
Reason (R) : Accumulation of variations in a species increases the chances of its survival in changing environment.
- (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.
Previously asked in CBSE board exam
2026 31/5/1 Q8
Generated by claude-sonnet-4-6 · 2026-06-15 06:51 · grounding rag
Model Answer
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Explanation
The textbook (Ch. 8) explicitly states that bacteria able to withstand heat survive better in a heat wave — confirming A. It also states that accumulation of variations gives species better chances of survival in a changed environment — confirming R. R directly explains A because heat-resistant bacteria survive due to the presence of accumulated variations in the population. Option (A) is therefore correct.
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