Question

A membrane which allows the passage of only ______ molecules and not of ______ is called a ______.

Answer 1

A membrane which allows the passage of only solvent molecules and not of solute particles is called a semipermeable membrane.

Explanation:

Solvent molecules are the ones that dissolve (like water in a salt solution). Solute is the substance being dissolved (like salt or sugar). A semipermeable membrane allows only the solvent to pass through, not the solute. This is a key concept in osmosis.