what is mechanism of stomatal transpiration
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Mechanism of stomatal transpiration involves following steps:
i. Osmotic diffusion of water from xylem to inter cellular spaces through mesophyll cells:
In side the leaf mesophyll cells are in contract with xylem and on the other hand with inter cellular spaces above the stomata. When water saturates the cell wal protoplasm and vacuoles of mesophyll cells by the water supplied by wxlem of leaf, then the cells become turgid. Their diffusion pressure deficit and osmotic pressure decrease with the result that they release water in form of vapours with the result that they release water in form of vapours into the inter cellular spaces close to stomata by osmotic diffusion. In turn the O.P. and D.P.D of mesophyll cells become higher and hence they draw water from xylem by osmotic diffusion.
ii. Opening and closing of stomata:
When the water from mesophyll cells and reach the mercellular spaces above stomata in form of vapour then stomatal movement or closing and opening of stomata is necessary for transpiration. The chief mechanism involved in stomatal transpiration is the mechanism of stomatal movement.
i. Osmotic diffusion of water from xylem to inter cellular spaces through mesophyll cells:
In side the leaf mesophyll cells are in contract with xylem and on the other hand with inter cellular spaces above the stomata. When water saturates the cell wal protoplasm and vacuoles of mesophyll cells by the water supplied by wxlem of leaf, then the cells become turgid. Their diffusion pressure deficit and osmotic pressure decrease with the result that they release water in form of vapours with the result that they release water in form of vapours into the inter cellular spaces close to stomata by osmotic diffusion. In turn the O.P. and D.P.D of mesophyll cells become higher and hence they draw water from xylem by osmotic diffusion.
ii. Opening and closing of stomata:
When the water from mesophyll cells and reach the mercellular spaces above stomata in form of vapour then stomatal movement or closing and opening of stomata is necessary for transpiration. The chief mechanism involved in stomatal transpiration is the mechanism of stomatal movement.
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Mechanism of Stomatal Transpiration:
Mechanism of stomatal transpiration involves following steps:
i. Osmotic diffusion of water from xylem to inter cellular spaces through mesophyll cells:
In side the leaf mesophyll cells are in contract with xylem and on the other hand with inter cellular spaces above the stomata. When water saturates the cell wal protoplasm and vacuoles of mesophyll cells by the water supplied by wxlem of leaf, then the cells become turgid. Their diffusion pressure deficit and osmotic pressure decrease with the result that they release water in form of vapours with the result that they release water in form of vapours into the inter cellular spaces close to stomata by osmotic diffusion. In turn the O.P. and D.P.D of mesophyll cells become higher and hence they draw water from xylem by osmotic diffusion.
ii. Opening and closing of stomata:
When the water from mesophyll cells and reach the mercellular spaces above stomata in form of vapour then stomatal movement or closing and opening of stomata is necessary for transpiration. The chief mechanism involved in stomatal transpiration is the mechanism of stomatal movement.
Mechanism of stomatal transpiration involves following steps:
i. Osmotic diffusion of water from xylem to inter cellular spaces through mesophyll cells:
In side the leaf mesophyll cells are in contract with xylem and on the other hand with inter cellular spaces above the stomata. When water saturates the cell wal protoplasm and vacuoles of mesophyll cells by the water supplied by wxlem of leaf, then the cells become turgid. Their diffusion pressure deficit and osmotic pressure decrease with the result that they release water in form of vapours with the result that they release water in form of vapours into the inter cellular spaces close to stomata by osmotic diffusion. In turn the O.P. and D.P.D of mesophyll cells become higher and hence they draw water from xylem by osmotic diffusion.
ii. Opening and closing of stomata:
When the water from mesophyll cells and reach the mercellular spaces above stomata in form of vapour then stomatal movement or closing and opening of stomata is necessary for transpiration. The chief mechanism involved in stomatal transpiration is the mechanism of stomatal movement.
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