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Effect of Surface Area on Transpiration
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| Submitted: Thu Jul 11 2002
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Effect of Surface Area on Transpiration Most of the water entering a plant does so via the root hairs. It travels across the root cortex to the xylem, ascends in the xylem to the leaves and is lost by evaporation from the surface of the mesophyll cells before diffusing out through the stomata. This process is called transpiration, and the flow of water from the roots to the transpiring surfaces forms the transpiration stream.. Transpiration is the loss of water vapour from the surface of a plant, and may occur from: 1) stomata: by evaporation of water from cells and diffusion of the water vapour through stomata, the pours found in the epidermis of leaves and green stems (about 90%). 2) waxy cuticles: by evaporation from the outer walls of epidermal cells through the waxy cuticle covering the epidermis of leaves and stems (about 10%, varying with thickness of cuticle). The aim of this...
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