Computer Interfacing
Transpiration
Forward
In plants, transport of water from roots to leaves follows a decreasing
water potential gradient. Transpiration, or loss of water from
the leaves, helps to create a lower osmotic potential in the leaf.
The resulting transpirational pull on a column of water moves
water from the xylem to the mesophyll cells to the air spaces
in the leaves. The rate of evaporation of water from the air spaces
of the leaf to the outside air depends on the water potential
gradient between the leaf and the outside air.
Various environmental factors, including those conditions which
directly influence the opening and closing of the stomata, will
affect a plant's transpiration rate. Temperature, humidity, opening
and closing of stomates, and light intensity affect the rate of
plant transpiration. This lab will measure transpiration rates
under different conditions of light, humidity, temperature, and
wind movement. The data will be collected by measuring pressure
changes as the plant takes up water into the stem
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