Question

7] Answers the following questions in 6-10 sentences each:
1) Name the structures responsible for gaseous exchange in the following organisms-

(a) Fish
(b) Cockroach
(c) Amoeba​

Answer 1

Explanation:

A Ans :-Fish and other aquatic organisms use gills to take up oxygen dissolved in the water and diffuse carbon dioxide out of the bloodstream. Some insects utilize a tracheal system that transports oxygen from the external environment through openings called spiracles.

B Ans :- When oxygen-rich air enters into the body of the cockroach via spiracles into the tracheal tubes, it diffuses into various tissues and cells of the body. Here, oxygen is used up to liberate energy. Likewise, carbon-dioxide rich air passes into the trachea and moves to the outwards through the spiracles.

C Ans :- In Amoeba, exchange of gases occurs by diffusion through the cell membrane.