XSIQ
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Biology - Transpiration

Transpiration

Uptake of water, transport and transpiration

The rate of transpiration depends on:

* humidity of atmosphere - the drier the air, the higher the
transpiration, because the concentration of water vapour outside the leaf
is less than that inside, i.e. the gradient is steeper; while the more
humid the air, the lesser the gradient and the lesser the rate of
diffusion, and less water is lost

* stillness of the air - moving air will take water particles away from
the leaf, allowing more to be lost from the leaf

* temperature of the atmosphere - warm air can hold more water vapour
than cold air

* degree of closure of stomata [1]

Transverse (cross) section of a leaf

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Links:
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[1] http://alison.com/#