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🅰️ ASSERTION–REASON (A/R) MCQs (Used standard options A–D pattern as in CBSE/JKBOSE) Options (Same for ALL A/R questions): A. Both Assertion and Reason are true and Reason is the correct explanation of AssertionB. Both Assertion and Reason are true but Reason is NOT the correct explanationC. Assertion is true but Reason is falseD. Assertion is

CASE STUDY–1: Bacterial Population A population of bacteria was exposed to high temperature. Most bacteria died, but a few survived and reproduced. After some time, the population consisted mainly of heat-resistant bacteria. CS-1.1 The surviving bacteria lived because they hadA. No variationsB. Useful variationsC. Perfect DNAD. Larger size Answer: B CS-1.2 The heat-resistant trait was