925 Define transpiration


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Transpiration is the loss of water vapour from leaves and other aerial parts of the plant. The water is lost through opening called stomata. The opening and closing of the stomata are due to specialized cells called guard cells. Transpired water has to be replaced by the intake of water at the roots. There is a continuous stream of water from the roots to the upper parts of the plant.

 

 

 

http://1.bp.blogspot.com/_ukAmOraSWJQ/SwLc_k_WVEI/AAAAAAAAAxI/mtAJ09EcwMA/s320/Transpiration.jpg

 

Suggestions for Assessment Questions:

- State one way transpiration is helpful to plants (1)

- State in which part of plant water vapor escapes through (1)

akira's question

State the outcome of the transpiration. (1)

State function of root, vascular, and leaf in transpiration(1)