question_answer 107)

  Explain the process of nutrition in Amoeba.

Answer:

                  Amoeba is a unicellular animal which follows holozoic mode of nutrition. The process of obtaining food by Amoeba is called phagocytosis.                                            The various steps involved in phagocytosis are (i) Ingestion Amoeba ingests food particle by forming temporary finger like projections called pseudopodia        around it. The food is engulfed forming a food vacuole.        (ii) Digestion Inside the food vacuole, complex substances are broken down into simpler ones by digestive enzymes.     (iii) Absorption The digested food present in the food vacuole diffuses into the cytoplasm. After this, the food vacuole disappears. (iv) Assimilation Food absorbed is used by Amoeba for various processes, (v) Egestion the remaining undigested material moves to the surface of the cell, the cell membrane ruptures at any place and undigested food is thrown out of the body.