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

Transport of water in plants

Soil-Soil water exists as a thin film in the soil, between soil particles; the concentration of cell sap of root hair is greater than that of the surrounding solution in the soil, thus drawing the water molecules across the cell wall and cell membrane into the root hair by osmosis.

Water drawn into the root hair cell dilutes the cell sap making it less concentrated than that in the adjacent cortex cells of the root

Due to osmotic gradient water moves from the root hair cells into the cortex by osmosis, from cell to cell by osmosis, across the endodermis by active transport into xylem vessels of the root that conduct water into xylem vessels of the stem into xylem vessels of the leaves.

Stem-Once in the stem water moves up the plant aided by the narrowness of the xylem vessels (capillarity), root pressure, and attraction of water molecules to each other (cohesion). Attraction of water molecules to the walls (adhesion).

From the stem, water enters the xylem of leaves.

Water moves in the xylem vessels of the stem in a continuous (uninterrupted) water column up to the tree leaves.

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