An organism X having breathing organs A lives on land. When organism X goes under water, it cannot survive for a long time unless carrying an oxygen cylinder. On the other hand, the organism Y having breathing organs B always lives in water and if taken out of water, it dies after a short while. A third organism Z having breathing organs C and D which lives on the banks of ponds, lakes and rivers can survive on land as well as in water equally well.
(a) What could organism X be? Name the breathing organs A.
(b) What could organism Y be? Name the breathing organs B.
(c) What could organism Z be? Name the breathing organs C and D.
(d) Out of X, Y and Z, which organism is (i) amphibian, (ii) aquatic, and (iii) terrestrial?

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Solution

(a) Organism X could be a human being. The breathing organs A are lungs.

(b) Organism Y could be a fish. The breathing organs B are gills.

(c) Organism Z could be a frog. The breathing organ C is skin and D are lungs.

(d) (i) Z is an amphibian.
(ii) Y is an aquatic organism.
(iii) X is a terrestrial organism.

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