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Question

Which of the following factor acts as anti-transpirant?

A
SO2
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B
CO
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C
CO2
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D
All pollutant gasses
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Solution

The correct option is C CO2
Transpiration is loss of water in vapour form through stomatal pores. Rate of transpiration depends on a number of factors, like temperature, humidity, light etc.
Carbon dioxide is one of the factors affecting transpiration. Excess concentration of carbon dioxide causes partial closure of stomata. This decreases rate of transpiration.

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