Question

The process by which water is absorbed by solids like colloids causing them to increase in volume is

• A. Plasmolysis
• B. Diffusion
• C. Osmosis
• D. Imbibition

Answer 1

The correct option is D Imbibition

a) Plasmolysis is the shrinking of the protoplasm as a result of water loss from osmosis when a cell comes in contact with a hypertonic solution.

b) Diffusion is random movement of molecules from the region of higher concentration to the lower concentration. It allows the gaseous exchange during transpiration from the stomata.

c) Osmosis is the process of movement of molecules from the region of higher concentration of solvent or lower concentration of solute to the lower concentration of solvent or higher concentration of solute through a semipermeable membrane.

d) The process of adsorption of water by solid particles of a substance without forming a solution is called imbibition. The water potential gradient between the absorbent and the liquid imbibed is essential for imbibition. The absorption takes place mainly due to adsorption and capillary action. The surface which absorbs the water is generally hydrophilic. It increases the volume of imbibants.

So, the correct answer is option D.