A) high humidity
B) excess of water in soil
C) low humidity, high temperature, guard cells are turgid (open) and moist soil
D) low velocity of wind
Correct Answer: C
Solution :
Increase in the temperature of the air decrease the humidity of the air and therefore are water is vapourised and lost from transpiring surface. When soil is moist means availability of water are sufficient, stomatawill open thus rate of transpiration increase.
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