question_answer 4)

Distinguish between intracellular and extracellular digestion?

Answer:

Differences between intracellular and extracellular digestion (i) Intracellular digestion It occurs inside the living cells with the help of lysosomal enzymes. Food particle is taken in through endocytosis. It forms a phagosome which fuses with a lysosome. The digested material pass into the cytoplasm. The undigested matter is throwh out by exocytosis. It occurs in Amoeba, Paramecium, etc. (ii) Extracellular digestion In case of coelentrates digestion occurs in gastrovascular cavity. This cavity has gland cells which secrete digestive enzymes over the food. The partially digested fragmented food particles are ingested by nutritive cells. It occurs in Hydra, Aurelia, etc.