A) If both Assertion and Reason are true and Reason is correct explanation of Assertion.
B) if both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: A
Solution :
The metabolic rate per gram weight is higher in smaller organisms and consequently greater is the need for the pumping action of the heart (heart rate) to supply nutrients and oxygen to the tissues. The heart rate of a six month old body is much higher that of the old person because of high metabolic rate. Therefore both assertion and reason are true and reason is the correct explanation of the assestion.
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