Question

(b) Write the mechanism by which fishes breath in water.

(c) Name the balloon likes structures present in lungs. List its two functions.

Answer 1

b)Fishes breathe thru gills and take up the oxygen present in water.
c) The balloon- like structures present in lungs are called lung alveoli.Their functions are: absorbing oxygen and assimilating them into the bloodstream.
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Answer 2

(b) - fishes breathes by taking water into its mouth and then forcing it out through gill passages. as water passes over the thin walls of gill the dissolved oxygen in water moves to the blood and travels to the fish cells.

(c) - Gills.
functions : 1. transfer of ions and water
2.exchange of oxygen, carbondioxide, acids and ammonia