Same chapter3 marksDifficulty: Medium
What is guttation, and how does it differ from transpiration?
Transpiration
3 marksDifficulty: Medium
Explain the mechanism by which a stoma opens.
Original Khojo Papers practice question — not from a past board paper.
Answer
When the guard cells take in water they become turgid. Because the wall next to the pore is thicker and less elastic than the outer wall, the guard cells bend outwards and the pore opens. The water enters because sugars or potassium ions accumulate in the guard cells and lower their water potential.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
When the guard cells lose water they become flaccid and the pore closes.
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