Page 224 - Primary Six Notes

Surface area of the leaf. Large surface area increases the

rate at which water is lost due to the number of stomata it may

have.

Humidity. This is the amount of water vapour in the at-

mosphere. High humidity leads to low transpiration because
there is a lot of water vapour around a leaf so no more vapour

can escape.

Number of stomata in a leaf. The greater the number of

stomata, the greater the rate of transpiration and the reverse

is true.

When a plant loses more water than it gains through the roots,

the plant wilts.

A wilting plant has droopy leaves and the stem is very weak. If

water is provided, the plant soon recovers from wilting.

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