question_answer

 

Direction:: Read the passage carefully and answer the questions that follow:

Hibernation is one of the main adaptations that allow certain northern animals to survive long, cold winters. Hibernation is like a very deep sleep that allows animals to save their energy when there is little or no food available. The body functions of 'true hibernators' go through several changes while they are hibernating. Body temperature drops, and the heart rate slows. For example, woodchuck.

Animals, such as the skunk and raccoon, are not considered true hibernators, as they wake up in the winter to feed, and their body functions do not change as much. Since they only sleep for a little bit at a time, the term 'dormancy' or 'light sleeping' is used to describe their behaviour. The largest animals to hibernate are bears. Hibernating animals also have a special substance in the blood called hibernation inducement trigger, or HIT. This substance becomes active in the fall, when the days become cooler and shorter.

The main reason behind hibernation of animal is:

 

A) To save their energy

B) To keep themselves from enemies

C) To go to long deep sleep

D) To survive long, cold winters

E) None of these