(i) Why do frogs use their lungs as well as skin for breathing?

(ii) How do plant roots take in oxygen?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

(i) On land, frogs use their lungs to breathe, but there are no ribs or diaphragm to support breathing. The skin of a frog is permeable to oxygen, carbon dioxide and water. There are a number of blood vessels near the surface of the skin. So, when a frog is underwater, oxygen is transmitted through the skin directly into the bloodstream.

(ii) Roots take up air from the air spaces present between the soil particles.

Answered by  | 4th Jun, 2014, 03:23: PM