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 the water, it dies after a short while. A third organism Z having to breathe 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 the organism Y be? Name the breathing organs B.
(c) What could the 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)Man,Lungs
(b)Fish,Gills
(c)Frog,Lungs and Skin
(d)(i) amphibian,-Z (ii) aquatic, -Y (iii) terrestrial -X

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(a)Man,Lungs (b)Fish,Gills (c)Frog,Lungs and Skin (d)(i) amphibian,-Z (ii) aquatic, -Y (iii) terrestrial -X

(a)Man,Lungs
(b)Fish,Gills
(c)Frog,Lungs and Skin
(d)(i) amphibian,-Z (ii) aquatic, -Y (iii) terrestrial -X