Transpiration occurs because of which of the following? absorption of water and dissolved minerals by root hairs hypertonic soil solutions relative to the root solution the closing of guard cells evaporation of water at stomatal surfaces osmotic pressure within xylem tissues
Q3: select the best answer that applies
Transpiration occurs because of the evaporation of water at the stomatal surfaces.
Transpiration is the evaporative loss of water by the plants. It mainly occurs through the stomata of the leaves . Besides the loss of water vapour in transpiration, exchange of the oxygen and carbon dioxide in the leaves also occurs through the pores called the stomata . Normally stomata are open in a daytime and close during the night . The immediate causevof the opening and closing of the stomata is a change in turgidity of the guard cells . The inner wall of each guard cell , towards the pore or the stmatal aperture is thick and elastic . When turgidity increases within the two guard cells flanking the each stomatal apertures or pore , the thin outer walls bulge out and forces the inner walls into a cresent shape.
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