Question

Briefly explain how respiration takes place in: a) Lower Organisms b) Insects c) Frogs​

Answer 1

Answer:

Cellular respiration takes place in the cells of all organisms. In the cell, the food (glucose) is broken down into carbon dioxide and water using oxygen. When breakdown of glucose occurs with the use of oxygen it is called aerobic respiration. Food can also be broken down, without using oxygen.

Answer 2

a) Lower Organisms:- The lower organisms breathe through the cell membrane by the diffusion of gases. All the minute organisms like amoeba and paramecium have no specialized organ for breathing. So, the gases are diffused by the cell membrane.

• Hydra breathes through the moist surface of the body.

b) Insects:- The body of the insects is covered with holes called spiracles. The oxygen enters these holes and reaches the trachea which helps them to circulate throughout the body.

• The carbon dioxide is carried by the trachea and expelled out through the spiracles.

c) Frogs:- A frog lives both on land and in water. Therefore, it exhibits different modes of breathing during different stages of its life cycle. It exhibits three different respiration modes:-

• Cutaneous
• CutaneousBranchial
• CutaneousBranchialPulmonary

The skin of the adult frogs is moist and slimy which helps them to respire in water and on land. On land, the exchange of gases in the adult frogs takes place through the lungs.

• The larval stages of frogs live in water and breathe through gills.$\:$