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Which one gives the most valid and recent explanation for stomatal movements?

1. Potassium influx and efflux
2. Starch hydrolysis
3. Guard cell photosynthesis
4. Transpiration

Correct answer: Potassium influx and efflux

Solution

The most accepted modern explanation is the potassium ion theory: K+ influx into guard cells lowers water potential, water enters, and stomata open; K+ efflux reverses this and closes them. This is more valid and recent than older ideas like starch hydrolysis.

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