Question

Excretion in Amoeba occurs through
(a)Contractile Vacuole
(b)Parapodia
(c)Plasmalemma
(d)Nucleus

Answer 1

Hint: Amoeba is a unicellular organism where all life processes take place in a single cell be it excretion, digestion, or respiration.

Complete answer:
The main excretory materials in amoeba are ammonia and carbon dioxide and these are formed as an end product of the processes of digestion and respiration. As amoeba is a unicellular organism i.e there is a singular cell present, there are no specialized excretory structures present in Amoeba. The body of amoeba is covered with plasmalemma which is a selectively permeable membrane. This plasmalemma is excretory in nature and the diffusion of ammonia takes place through plasmalemma.

Additional Information: -Some characteristic features of the Amoeba are:
-Amoeba belongs to the class Sarcodina or Rhizopoda in the phylum protozoa.
-Locomotion in amoeba is known as an amoeboid movement.
-Amoeba contains a nucleus, a contractile vacuole, food vacuoles, and all other cell organelles.
-The contractile vacuole in the amoeba also removes some water materials from the body.
- Pseudopod is a special extension of the plasma membrane that helps with the uptake of food.
- Amoeba is usually found in freshwater and is microscopic in size.
So, the correct answer is ‘plasmalemma’

Note: The contractile vacuole in amoeba is analogous to the uriniferous tubules of the frog.
A circumvallation is shown by the amoeba which is the engulfment of active prey like ciliate or flagellate.
The food vacuole of amoeba is analogous to the alimentary canal of the animal or the gastrovascular cavity of the hydra.