MCQ practice · SSC Biology Board questions · Chapter 6: Transport in Organisms
Why is it hard to close and open the doors of a house in the rainy season?
Think it through first, then pick an option.
- a Diffusion
- b Osmosis
- c Transpiration
- d Imbibition
Answer and explanation
Correct answer: d Imbibition
Wood is a colloid, so in the rains it takes up water and swells; this absorption is imbibition.
Why the other options are wrong
- a Diffusion: Diffusion spreads molecules; it does not swell wood. The door sticks because wood soaks up water and swells.
- b Osmosis: Osmosis needs a selectively permeable membrane, which dry wood does not have; wood takes water by imbibition.
- c Transpiration: Transpiration is loss of vapour from a plant; it has nothing to do with a wooden door swelling.
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