Q2 of 35 Page 113

Describe the various methods of excretion in animals.

● Amoeba: - Excretion by diffusion through their body surface.


● Protozoa: - No specific organ for excretion. Excretion by diffusion through the plasma membrane.


● Hydra: - Through mouth.


● Flatworms or leeches: - Highly specialized organ for excretion called simple tubular structure.


● Insects: - Tubular structure for excretion.


● Vertebrates: - Kidneys.


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15

Study the following model with which the transpiration mechanism in plants can be demonstrated


With which structure of the plant do you compare each of the following?


(i) Sponge (ii) Glass tube filled with water.

 1

Describe the various movements of plants giving suitable examples.

 3

Compare the respiration in higher plants with the respiration of lower plants.

 4

In the touch - me - not plant the leaves show movements. What type of movement have you observed? Discuss.