Assertion : Smaller the organism,higher is th | vedclass

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(A) The Basal Metabolic Rate $(BMR)$ is defined as the energy requirement of the body at rest. Smaller organisms have a higher surface-area-to-volume

Vedclass · Accepted Answer

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) The Basal Metabolic Rate $(BMR)$ is defined as the energy requirement of the body at rest. Smaller organisms have a higher surface-area-to-volume ratio,leading to greater heat loss and consequently a higher $BMR$ per gram of body weight to maintain homeostasis.Metabolic rate is directly correlated with physiological parameters like heart rate. $A$ six-month-old baby has a significantly higher metabolic demand and a faster heart rate ($70-190$ beats/minute) compared to an elderly person ($60-100$ beats/minute).Therefore,both statements are correct,and the higher heart rate in a baby serves as a physiological example supporting the higher metabolic rate observed in smaller organisms.

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 higher than that of an old person.

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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 higher than that of an old person.