Transpiration and Factors Affecting it

This is a short one page summary of transpiration. 

The other thing which you need to know about in junction with transpiration is how to measure it, by using a potometer.  I will be uploading a revision note about this if you want to know more.

Hope this helps. 

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Transpiration is the process of water evaporating from plants. This happens through the
stomata in the lower epidermis of leaves. Transpiration, using cohesion, is the way in
which water is pulled through the stem of a plant. There are various things which affect
the rate of transpiration and this is also important in plants which live in hot and dry
areas which need to maintain water, called xerophytes.
The following table shows factors which affect transpiration:
Factor How? Increase Transpiration
Plants photosynthesise
and to do this, they
need light. Therefore,
Light Light Dark
in the night the stomata
are closed, limiting
water loss
High temperatures
increase kinetic energy
of water molecules,
making them move
Temperature faster and therefore High Temperatures Low Temperatures
evaporate faster. High
temps also increase the
capacity for air to hold
water (humidity)
If the air is very humid
(there's a lot of water
in the air) then this will
decrease the water
Humidity potential gradient Low Humidity High Humidity
between the leaves
and air, making water
not diffuse out of the
leaves as quick
If there's low air
movement, water from
the air settles on the
Air Movement leaves near the Lots of air movement Not much air movement
stomata and decreases
the water potential


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