TRANSPORT IN PLANTS : TRANSPIRATION

THE MOVEMENT OF WATER FROM THE SOIL TO THE LEAVES
Movement of water through the root

Root hair

*TSA/V is big

*Large surface for *absorption of water by osmosis

*Absorption of ions is achived by active transport

Cells in the cortex layer

*the cellsbecome hypotonic compare to the adjacent cells

*water diffuses through the cytoplasma, vacoule and cell wall of the parenchyma cells until it reaches the endodermis

Endodermis cells

*water diffuses through the cytoplasma andvacoule only

*Casparian Strips lining the side of the cell wall is impermeable to water

Xylem vessel

*The gradient of water concentration resulting an inflow of water into the xylem vessels

*ions is actively transported

*osmotic pressure is increace causing a continous inflow of water –generating Root Pressure

Movement of water through the stem

Xylem vessel

*long, narrow and continuos column generates capillarity

Capillarity / capillary action involving

*the cohesive forces (between water molecules) *adhesive  forces ( water molecules adhere to the xylem wall.)

*forming acontinuos water column within the xylem vessel

*Root Pressure- exerted by the root of a plant

*Transpiration Pull due to the proses of transpiration ocuring at stomata.

Continous upward movement of water in the stem

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