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Q.

Choose the correct statement. 

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a

Transpiration takes place only through stomata 

b

Stomata are useful only for transpiration

c

Normally stomata are closed during day time

d

The immediate cause for opening and closing of stomata is change in the turgidity of guard cells.

answer is D.

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Detailed Solution

Transpiration not only takes place through stomata but also through lenticels and cuticle. Stomata are not only involved in transpiration but also in exchange of gases. Stomata are normally opened during day time and closed during night time. Variation in turgor pressure is the immediate cause for opening and closing of stomata. 

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