Question

All mammals and birds are able to

• A. Keep their body temperature constant
• B. Decrease their body temperature when the surrounding temperature becomes low
• C. Increase their body temperature when the surrounding temperature becomes high
• D. Increase their body temperature when the surrounding temperature is low

Answer 1

Answer: (A)

All birds and mammals are able to maintain homeostasis by physiological as well as behavioural means, which ensures constant body temperature
Humans have a constant body temperature i.e., 37 ⁰C. The evaporative cooling by profuse sweating from the body during summer brings down the temperature. In winter, when the temperature of the body is much lower than 37 ⁰C, the body starts shivering, a kind of exercise that produces heat and raises the body temperature.