Guard cells swell when _____ flows into them, causing the stomatal pore to open.
- enzyme
- chemical
- water
- hormone
Show answer and 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._