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

Mitochondria

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Vacuoles

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Plastids

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Ribosomes

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Solution

The correct option is B Vacuoles
When a plant cell takes in water by endosmosis, the water enters the central vacuole. The tonoplast stretches and exerts a turgor pressure on the cell wall.
The mitochondria, plastids and ribosomes have no role to play in osmotic expansion.

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