Question

Read the given statements and select the correct ones.
(i) A membrane which permits the passage of pure solvent molecules to pass through it and not the solute particles is called semi-permeable.
(ii) A membrane which allows some substances to pass through it more readily than others is known as selectively/differentially permeable.
(iii) All living biological membranes are perfectly semipermeable.

• A. (i) and (iii)
• B. (ii) and (iii)
• C. (i) and (ii)
• D. All are correct

Answer 1

The correct option is C (i) and (ii)

• There are certain membranes, which allow penetration of only solvent molecules but not the solute particles. Such membranes are known as semi-permeable. Examples of such membranes are cellophane, fish and animal bladders, egg membrane, plasma membrane, etc.
• The biological membranes are not perfectly semi-permeable. They allow to pass solute molecules only up to a certain extent and are, therefore, selective in nature. They are known as selectively or differentially permeable membranes.
• All living biological membranes are differentially permeable membranes, which allow some substances to pass through it more readily than others.

So, the correct answer is option C.