Question

Question 10: Distinguish between the following: (a) Hibernation and Aestivation (b) Ectotherms and Endotherms

Class 12 - Biology - Organisms and Populations Page 240

Answer 1

Hibernation :


° Hibernation is a state of reduced activity in some organisms to escape cold winter conditions.

° Bears and squirrels inhabiting cold regions are examples of animals that hibernate during winters.

Aestivation :

° Aestivation is a state of reduced activity in some organisms to escape desiccation due to heat in summers.


° Fishes and snails are examples of organisms aestivating during summers.

Ectotherms :

° Ectotherms are cold blooded animals. Their temperature varies with their surroundings.

° Fishes, amphibians, and reptiles are ectothermal animals.

Endotherm :

° Endotherms are warm blooded animals. They maintain a constant body temperature.

° Birds and mammals are endothermal animals.

Answer 2

Hibernation and aeativation both requires escape in time but hibernation is winter sleep and aeativation is summer sleep. In both the energy is saved by reduced activity. Hibernation example- bear Aeativation example- fishes and snail Ectotherm are cold blooded animals . Their body temperature changes with external temperature.that means they conform ( change with environment) Endothermic organism regulate ( keep their body at a constant phase) that means they do not change with external temperature . They are also called warm blooded animals.