A pressure created by active secretion of salts and other solutes from other cells into xylem sap is called___________?
Correct answer: B. Root pressure
- A. Transpiration pull
- B. Root pressure
- C. Osmotic pressure.
- D. None of these
Explanation
Root pressure develops when root cells actively accumulate salts in the xylem, lowering the xylem water potential and drawing water into it by osmosis. Students may choose transpiration pull, but that is the tension generated mainly by evaporation from leaves, not positive pressure produced in roots.
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