Question

What data do you have suggesting the rate of transpiration is regulated by guard cells and related to leaf area?

Answer 1

e Transpiration is the phenomenon of loss of water in the form of rapous from the internal tissue of aerial parts of planets under the influence of Sunlight and related to some extend of protoplasm stomata are pored in the leaf that allow gas enchon achere water vapor leaves the plant and carbon dioxin entera. special cell called geared cells control and pore's opening and closing. open stomata have borrosion turgid cell and close stomata have planced guard cell There are many theory that explain the opening and closing of stomata a ta seg az •Theory of photosynthesis in guard cell • starch sugar inter concertion theory Theory of starch glucose interconvertion •Theory of glycolate metabolism. to. Tony • Theory of proton transport. Among those theory from starech sugare interconvertion theory are found that respiratory coa contain in the intercellulare space is used up by the mesophyll cell in photosyre thesis, there pt of the guard cell rese as co concentration decreased, so the acidity decrease which favous hydrolysis of starch into sugar. 50 osmotic pressure of the cell sap of the geared cell oncrease and water enter into the grored cell and turgos pressure increase and stomata open in light.

he dark condition no photosynthesis occups so respiratory coa accumulates in the intercellular space sopt of gaard cell falls. so the acedety increase achich fanours convertion of suger into streck. Then osmotic pressure of the sap! of guard cell decreased. Enoosmosis of water takes place and the turgass pressure and volume of guard cell decreased and stomata closed in where stomata open water vapour leaves The plant. boy so open stomata increase transpiration reate and closed stomata decrease transpiration reate. To at Plant have many storrata apto 400 per mm on their leaf surface and they are usually present on the lower surface of leaf Perstomata ontaen two guard cell: so, where leaf area increased then no of stomata increase and by this no of guard cell also increased so for thes reason amount of transpiration also increase. I