Question

it is said that cell wall in plant cell withstands the hypertonic and hypotonic solutioṇ . but raisin is also a plant cell . why do it get swollen up?

Answer 1

Swelling or shrinking of plant cell is due to the inward or outward movement of water. Inward movement of water results in the increase in the size of cell membrane that exert pressure on cell wall and cell swells and outward movement of water results in the shrinkage of cell membrane away from the cell wall and hence shrinkage of cell.