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A stoma opens during the day because its guard cells change in a particular way. Which change directly causes the stoma to open?
AGuard cells lose all water
BGuard cells become turgid
CGuard cells become flaccid
DGuard cells stop respiring
Answer & Solution
Correct answer: B. Guard cells become turgid
1. Stomatal opening and closing depends on guard cell turgidity.
2. When water enters guard cells they swell and become turgid, opening the stoma.
3. Losing water makes them flaccid and closes the stoma, ruling out options A and C.
4. So opening is caused by guard cells becoming turgid, option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Transpiration", p.209_
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