The stomatal pore opens when:

Guard cells swell up

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Chloroplast of guard cells shrink

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Guard cells shrink

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Chloroplast of guard cells swell up

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Solution

The correct option is A
Guard cells swell up

The stomatal pore opens when the guard cells surrounding it absorb water and swell up.

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Similar questions

Stoma opens when -

1)guard cell swell due to an increase in their water potential

2)guard cell swell by endosmosis due to influx of proton

3)guard cell swell by endosmosis due to efflux of potassium ion

4)guard cells swell due to a decrease in their water potential

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