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Solution


Q.

The osmotic expansion of a cell kept in water is chiefly regulated by             [2014]
1 mitochondria  
2 vacuoles  
3 plastids  
4 ribosomes  

Ans.

(2)

Vacuoles are non-cytoplasmic areas present inside cytoplasm and separated from latter by tonoplast. They are believed to be formed by expansion and pinching off from ER. There occurs a large central vacuole and many small vacuoles in plant cells. They play a major role in osmotic expansion of a cell.