3rd Class Science Living and Non-living Things Breathing

   Breathing in Living Things

In breathing process, living organism, takes in oxygen and gives out carbon dioxide gas. There are special organs in the living body which perform these functions. These organs are called breathing organs. Different types of organisms have different kinds of breathing organs. The following table shows the organisms and their breathing organs.

Look at the following flow chart of breathing organs in different living organism:

Animals obtain oxygen through breathing process, which produces energy by oxidizing digested food. Like animals, plants also take in oxygen for breathing and give out carbon dioxide all the time.                                         

      Which one of the following doesn't breathe?

       (a)                                                (b)                                         (c)                                               (d)                                      (e) None of these

Answer: (d)

Explanation

All living organisms, plants and animals breathe in oxygen and breathe out carbon dioxide. Book is non living thing, hence does not breathe. Therefore, option (d) is correct and rest of the options is incorrect.

     Which one of the following animals has two types of respiratory organs?

(a) Human

(b) Insects

(c) Tiger

(d) Frog

(e) Dolphin

Answer: (d)

Explanation

Frog is an amphibian which can live both on the land and in water. It breathes through its lungs when it is outside the water and with moist skin when it is inside water. Therefore, option (d) is correct and rest of the options is incorrect.