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?

Question

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?

Accepted Answer

Organism X is a human The breathing organs A are lungs.
Organism Y is a The breathing organs B are gills.


Organism Z is a The breathing organ C is skin and D are lungs.


(i) Z is an amphibian because it leaves both on land and

Y is an aquatic organism because it leaves only in
X is a terrestrial organism because it leaves only on

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