Practice question

MCQ

Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Heat and extremes of pH cause denaturation, or melting of double- helical DNA Reason R: Breaking of covalent bonds of DNA causes unwinding of the double helix In the light of the above statements, choose the most appropriate answer from the options given below

Options

Choose one · Correct answer highlighted

Both A and R are correct and R is the correct explanation of A Both A and R are correct but R is NOT the correct explanation of A correct explanation of A A is correct but R is not correct Correct A is not correct but R is correct

Explanation

The principle of quantitative reasoning explains that ratio, percentage and series logic determine correct calculation. Hence A is correct but R is not correct fits best because it meets mathematical and logical criteria, as documented in authoritative sources on aptitude and reasoning.

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Class IX Science 14 Sep 2026

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