VACOULES AND VESICLES

Vacuoles and vesicles are membrane-enclosed sacs within the cell. But vacuoles are larger than vesicles. Vacuoles have various functions.

1. They form food by phagocytosis.
2. Many freshwater protists have contractile vacuoles These vacuoles pump excess water out of cell.
3. Certain vacuoles are filled with pigments. These pigments give colour to the cell. For example melanin pigment is present in the human skin cells.
4. Some protozoa have vacuole for storing food.

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