alleryAs water evaporates from the leaves, a suction force develops that draws more water up the xylem column from the roots. This force is called what?
AImbibition force
BRoot pressure
CTranspiration pull
DCapillary action
Answer & Solution
Correct answer: C. Transpiration pull
1. Water lost from the leaf lowers water in mesophyll cells.
2. This creates a pulling tension at the top of the xylem.
3. Root pressure pushes from below, not pulls from the top, so option B is wrong.
4. The suction created by leaf evaporation is transpiration pull, option C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Transpiration", p.209_
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