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ICSE Class 10 Biology Question 2 of 5

Cell — The Structural and Functional Unit of Life — Question 4

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4
Question

Question 4

Assertion. Cell membrane is freely permeable.

Reason. Cell membrane permits free movement of the solutions across the membrane when two solutions of different tonicity are separated through it.

  1. Both A and R are True.
  2. Both A and R are False.
  3. A is True and R is False.
  4. A is False and R is True.
Answer

Both A and R are False.

Explanation
A cell membrane is semi-permeable. It selectively allows the passage of some molecules while preventing others. Solutions of different tonicity will result in osmotic movement of water, but not necessarily the free movement of solutes across the membrane.