Question

It is much easier for a small animal to run uphill than for a large animal, because - ?

• A. small animals have lower $O_2$ requirement
• B. the efficiency of muscles in larger animal is less than in smaller animal
• C. it's easier to carry a small body weight
• D. smaller animals have higher metabolic rate

Answer 1

The correct option is D smaller animals have higher metabolic rate

It has been observed that the metabolic rate of an organism is inversely proportional to its body weight, that is smaller animals have a higher metabolic rate. This higher metabolic rate allows them to have higher energy and are quicker in climbing heights as compared to larger animals.

So, the correct answer is 'smaller animals have higher metabolic rate'.