Course Content
TRANSPORT IN PLANTS AND ANIMALS
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EXCRETION AND HOMEOSTASIS
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Biology Form 2
About Lesson

Transpiration in a Leaf

Water continuously evaporates from the spongy mesophyll cells into the intercellular air spaces where it then diffuses out into the atmosphere through the stomata.

Osmotic pressure in the mesophyll cells rises and draws water from neighbouring cells which in turn draw water from other cells.

Water is eventually drawn from the xylem vessels in the veins.

This movement of water in a continuous column from roots to the leaves is called the transpiration stream. The stream remains unbroken.

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