Question
Which life process in plants is most directly affected when guard cells lose water?
This question was previously asked in
HTET 2025 Level 1 PRT Question Paper (5-Jul-2026)
The correct answer is
Transpiration
When guard cells lose water (become flaccid), stomata close, directly reducing transpiration -- the loss of water vapour from the plant through stomatal openings -- since the pathway for water vapour escape is shut.
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