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What is transpiration? Give the importance of transpiration.
 
a. Transpiration is the loss of  from the aerial parts of plant in the form of .
 
b. Transpiration creates transpirational pull for transport of water.
 
c. Transpiration provides the water required for the process of photosynthesis.
 
d. Transpiration transports food to all the parts of the plant.
 
e. Through transpiration, the surface of the leaves is cooled by evaporation.