Question

Which of the following groups of animals maintain high and constant body temperature such as mammals?
A) Reptiles
B) Amphibians
C) Birds
D) Fishes

Answer 1

Hint:Surviving the change of temperature is a process found in many animals, insects and birds and the phenomenon is known as thermoregulation. Some animals survive through the extreme fluctuations in temperature by undergoing hibernation, or by entering a dormant stage, they undergo adaptation according to the environment by making some physical modification.

Complete answer:
Reptiles are called as poikilothermic as they can change their body temperature according to the environment. Amphibians are also poikilothermic and they can also change their body temperature but the organisms which are evolved after these classes are not poikilothermic, they cannot change their body temperature according to the temperature of the surrounding hence called as Homeothermic, where Homo means Same and Thermic means temperature or heat. Aves and mammals are homeothermic organisms. Birds can tolerate upto 40 and they undergo migration in order to survive.This is because homeothermic animals undergo a specialised process called thermoregulation and hence maintain constant body temperature, this mechanism is not seen in poikilotherms, so birds can maintain constant temperature as of mammals.

Therefore the correct answer is option C.

Note:Homeotherms undergo migration or make artificial arrangements to fight against extreme alteration in temperature whereas poikilotherms undergo dormant stage when there is extreme alteration in temperature but some can survive upto 80 to 90 degrees