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

Plastids

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Ribosomes

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Vacuoles

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Mitochondria

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Solution

The correct option is C Vacuoles
The osmotic expansion of a cell kept in water is chiefly regulated by the vacuole.

The turgor pressure is maintained by the central vacuole in the case of hypertonic, hypotonic as well as in and isotonic solutions. This organelle takes approximately $90 %$ of the total cell space.

So, the correct answer is "option D"

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