Answers

2014-07-27T14:44:19+05:30
Transpiration exert a pull force on the water present in the xylem, this helps in pulling the water upwards. Also, transpiration helps in the regulation of the tree temperature. 
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2014-07-27T14:45:03+05:30
Transpiration is the evaporative loss of water vapour from areal parts of plant.
the significance of transpiration is the loss of water when water present inside the plant is excess
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am not saying to mark it best but write how is the answer