Distinguish between intracellular and extracellular digestion.
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Differences between intracellular and extracellular
digestion are
(i) Intracellular digestion 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
passes into the cytoplasm. The undigested matter is
thrown out by exocytosis. It occurs in Amoeba
Paramecium, etc.
(ii) Extracellular digestion In case of coelenterates
digestion occurs in gastrovascular cavity. This cavity
has gland cells which secrete digestive enzymes over
the food. The partially digested fragmented fO
particles are ingested by nutritive cells. It occurs
Hydra, Aurelia and higher animals, etc.