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Guard cells swell when _____ flows into them, causing the stomatal pore to open.
Aenzyme
Bchemical
Cwater
Dhormone
Answer & Solution
Correct answer: C. water
1. Stomata open when guard cells become turgid.
2. Turgidity is caused by water flowing into the guard cells.
3. Hence water flowing in opens the stomatal pore.
_Source: RRB Group D CEN-02/2018 PYQ, Q.40._