A) mitochondria
B) vacuoles
C) plastids
D) ribosomes
Correct Answer: B
Solution :
The osmotic expansion of a cell kept in water is chiefly regulated by vacuole. It is the single and large organelle which constitutes about 20% of plant cells and is small and multiple in animal cells. Vacuole store water and macromolecules including ions, sugar, amino acid, protein and carbohydrates. The membrane that surrounds the vacuole is called tonoplast. The vacuole contains cell sap m it. The cell sap has high osmotic pressure which generate turgor pressure in plant cells.
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