The rate of transpiration is more in hot and sunny day because...
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Solution
The evaporation of water from the aerial parts or excess loss of water from aerial part of the plant is called transpiration. Transpiration is carried in leaves where stomata opens passage for carbondioxide and oxygen during photosynthesis.
Plants transpire more in sunny and hot days due raise in temperature because of this plants transpire as water evaporates rapidly. At 30 degree leaves transpire three times more.