Explain the process of nutrition in Amoeba.

Amoeba is a unicellular animals which follows holozoic mode of nutrition . The process of obtaining good by Amoeba is called phagocytosis .
The various steps involved in phagocytorsis.
(i)

Explanation

Amoeba is a unicellular animal found in fresh water which follows holozoic mode of nutrition. It feeds on microscopic plants and animals present in water and the process of obtaining food animals present in water and the process of obtaining food by amoeba is called phagocytosis. The different processes involved in the nutrition of amoeba are :
(i) Ingestion : Ingestion is the process of taking food in the body. As it is a unicellular animal, thus it doesn.t have a mouth for ingestion of food. The cell membrane of amoeba keeps on protruding into pseudopodia and takes in food using temporary finger-like extensions of the cell surface which fuse over the food particle forming a food-vacuole.
(ii) Digestion : Digestion is the process of breaking the large and insoluble molecules in small and water soluble molecules. Digestive enzymes are secreted in the food vacuole and digestion takes place. several digestive enzymes react on the food present in the food vacuoles and break it down into simple and soluble molecules which then diffuse into the cytoplasm.
(iii) Absorption : The food digested by digestive enzymes is then absorbed from the food vacuole in the cytoplasm by the process of diffusion. while the undigested food remains in the food vacuole. If a large amount of food is absorbed by Amoeba, the excess food is stored in the cytoplasm in the form of glycogen and lipids.
(iv) Assimilation : During this step the food absorbed by the cytoplasm is used to obtain energy, growth and repair. This process of utilizing absorbed food for obtaining energy, repair and growth is called as similation.
(v) Egestion : When an adequate amount of undigested food gets collected in the food vacuole, it is ex pelled out of the body by rupturing cell membrane. The process of removal of undigested food from the body is called egestion.