Question

Which of the following types of animals are affected the most by temperature changes in the environment?
A) Birds
B) Desert living
C) Poikilothermic
D) Homoiothermic

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:
Birds can tolerate temperature upto an average of 40 degrees and then they undergo migration where they travel to regions which have sustainable temperature and continue to survive, migration is seen in packs or flocks. Some birds migrate throughout the year in search of food or to avoid extreme fluctuations in the environment. Desert living animals can tolerate high temperature due to their physical modification. Poikilothermic animals are those animals which can change their body temperature according to the environment. Homeothermic animals are those animals which cannot alter their body temperature and can maintain homeostasis by a process known as thermoregulation.
So, poikilothermic animals cannot regulate their body temperature due to the lack of the enzymes needed for that.

Therefore, the correct answer is Option C.

Note:Poikilotherms such as some insects undergo dormant stage and arrest its life process until and unless it finds a suitable temperature to live. Some of the insects can raise their body temperature upto 80 degrees. These are exceptional cases.