Question

An organism X having breathing organs A lives on land. When organism X goes underwater, 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 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.

1. What could organism X be? Name the breathing organs A.
2. What could organism Y be? Name the breathing organs B.
3. What could organism Z be? Name the breathing organs C and D.
4. Out of X, Y, and Z, which organism is (i) amphibian, (ii) aquatic, and (iii) terrestrial?

Answer 1

1. Organism X could be a human being. The breathing organs A are lungs.
2. Organism Y could be a fish. The breathing organs B are gills.
3. Organism Z could be a frog. The breathing organs C and D are the skin and the lungs.
4. 1. Z is an amphibian.
   2. Y is an aquatic organism.
   3. X is a terrestrial organism.