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Transportation in Plants — BIOLOGY STD 8 — Question

ICSE BoardEnglish MediumSTD 8BIOLOGYTransportation in Plants2 Marks
Question
How does temperature, light intensity and wind affect transpiration?
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Answer

Temperature: Transpiration is faster on hot summer days as compared to cold winters.
Light intensity: The transpiration rate is increased due to the increase in light intensity. During daytime in the sunlight, the rate of transpiration is faster. This is because the stomata remain open to allow the inward diffusion of carbon dioxide for photosynthesis. During dark, the stomata are closed, and hence transpiration hardly occurs at night.
Wind: Transpiration is more when the wind is blowing faster as water evaporates faster from the leaves.

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