Same chapter3 marksDifficulty: Medium
Distinguish between endosmosis and exosmosis, and give one example of each.
Absorption by Roots
3 marksDifficulty: Medium
What is root pressure and what part does it play in the ascent of sap?
Original Khojo Papers practice question — not from a past board paper.
Answer
Root pressure is the positive pressure developed in the xylem of the roots by the active absorption of water and salts. It pushes water a short way up the stem, but it cannot account for the ascent of sap in a tall tree, which depends mainly on transpiration pull.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Root pressure is what causes guttation and the bleeding of a cut stem.
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