| Direction: For question numbers two statements are given-one labeled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes [a], [b], [c] and [d] as given below. |
| Assertion Cells having cell wall withstand very dilute (hypotonic) external media without bursting. |
| Reason The cell wall exerts an equal pressure against the swollen cell. |
A) Both A and R are true and R is correct explanation of the A
B) Both A and R are true, but R is not the correct explanation of the A
C) A is true, but R is false
D) A is false, but R is true
Correct Answer: A
Solution :
| [a] Both A and R are correct and R is the correct explanation of A. |
| In hypotonic medium, cells takes up water from the external medium by the osmosis. |
| Due to high amount of water inside, the cells swell up and build up pressure against the cell wall. |
| At this point, the cell exerts an equal pressure against the swollen cell. Thus, because of the presence of cell wall, cells can withstand very dilute external media without bursting. |
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