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

1. Mitochondria
2. Vacuoles
3. Plastids
4. Ribosomes

Correct answer: Vacuoles

Solution

Vacuoles store water and solutes, helping regulate osmotic balance and turgor pressure in cells. When a cell is in water, the vacuole expands and is the main structure involved in this osmotic response.

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