Title 11 Transport in plants ppt - part 4.pdf ✅

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• It is the evaporative loss of water by plants through the stomata in the leaves. • Less than 1% of the water reaching the leaves is used in photosynthesis and plant growth. The remaining is lost by transpiration. • Transpiration can be studied using cobalt chloride paper. It turns colour (blue to pink) on absorbing water. • During transpiration, exchange of O2 & CO2 in the leaf also occurs. bankofbiology.com Cobalt chloride paper experiment
• Stomata are open in day time and close during night. • Opening or closing of stomata is due to change in the turgidity of the guard cells. • The inner wall of guard cell lining stomatal aperture is thick and elastic and the outer wall is thin. • When turgidity of guard cells increases, the outer walls bulge out and pull the inner walls into a crescent shape. bankofbiology.com