Question

(a) What are the methods used by plants to get rid of their waste products?
(b) How are waste products excreted in Amoeba?

Answer 1

(a) Following are the various methods used by plants to get rid of their waste products.

• The gaseous wastes are removed through stomata in leaves and lenticels in stems.
• Some wastes are removed in the form of gums and resins.
• Some of the waste products are excreted into the soil around them.

(b) Amoeba excretes excess carbon dioxide, water and ammonia. Carbon dioxide is excreted by diffusion through the cell membrane, while excess water and nitrogenous waste like ammonia is removed by the contractile vacuole.