Question

Which of the following is a group of warm blooded animals?
A) Birds
B) Fishes
C) Amphibians
D) Reptiles

Answer 1

Hint:Warm blooded animals are those animals which can maintain a constant body temperature according to the environment.By regulating body metabolic activity they can change their body temperature.

Complete answer:
>Birds are warm blooded, endothermic animals.These generate body heat by using their internal thermal regulation.
>Their constant body temperature does not change according to the environment.They employ the body's metabolic activity for heat production or loss to maintain the constant temperature.
>Feathers on their body protect them from extreme cold weather.
>On the other hand, Fishes, amphibians and reptiles are cold blooded animals means their body changes their temperature according to the surroundings.
>In Fishes, the heat produced is easily lost through skin or gills.Their temperature according to the temperature of water.So they move to the different depths of water to attain a temperature suitable for their survival.
>Amphibians are cold blooded animals because they have a special skin type.If they are under sun for too long it can damage their cells or if they are under wind for long it can dry their skin and dehydrate them.They are ectotherms.
>Reptiles can also not maintain their body temperature, they rely on the surrounding for their body temperature.That is why they are found basking under sun for heat and retreat themselves to shade when too hot in order to maintain body temperature required for their survival.

Hence, the correct answer is option (A) i.e, Birds

Note:Warm-blooded animals are of two types:-
(i) Endothermy- These types of animals maintain their body at metabolically favorable temperature mostly by using heat produced by internal body functions.
(ii)Homeothermy- These animals maintain stable internal body temperature regardless of external influence.