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Movement of water molecules across a semi-permeable membrane from a region of higher water concentration to a region of lower water concentration is called which process?
AImbibition
BOsmosis
CActive transport
DPlasmolysis
Answer & Solution
Correct answer: B. Osmosis
1. The key clues are 'water', 'semi-permeable membrane' and 'higher to lower'.
2. Imbibition is swelling of dry solids, so option A is wrong.
3. Active transport needs energy and moves uphill, so option C is wrong.
4. The passive water movement through a semi-permeable membrane is osmosis, option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Osmosis", p.208_
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