Assertion: Smaller the organism higher is the rate of metabolism per gram weight.
Reason: The heart rate of a six-month-old baby is much lower than that of an old person.

Options

A. If both assertion and reason are true reason is the 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.

Answer

B

Explanation

Both assertion and reason are true but reason is not the correct explanation of assertion
The basal metabolic rate is defined as the energy requirement of the human body at rest and reflect the caloric needs of the body. BMR can be determined by total body weight and the amount of muscle mass . BMR is inversely related with the weight or volume of an organism, i.e, smaller the organism , higher is the basal metabolic rate and vice varsa.
Heart rate of six month old baby is `110-112` beats/min. Though it is higher than normal adult person. but it is lower than the old person. At the age of 60, a man may have maximum heart rate of 160 beats/min (avg 120 beats/min) .