The osmotic expansion of a cell kept in water is chiefly regulated by

Options

A. mitochondria
B. vacuoles
C. plastids
D. ribosomes

Answer

B

Explanation

The osmotic expansion of a cell kept in water is chiefly regulated by vacuole. It is the siugle and large organelle which constitutes about 20% of plant cells and is small and multiple in animal cells. Vacuole store water and macromoleculesincluding ions, sugar, amino acid, protein and carbohydrates. The membrane that surrounds the vacuole is called tonoplast. The vacuole contains cell sap in it.
The cell sap has high osmotic pressure which regulate turgor pressure in plant cells.