Question : Transpiration is a necessary evil. Justifly the statement by highlighting the harmfuland useful aspectsof thisprocess.

Question : Transpiration is a necessary evil. Justifly the statement b

1.	Question : Transpiration is a necessary evil. Justifly the statement by highlighting the harmfuland useful aspectsof thisprocess.
Answer» Solution :Transpiration is a necessary evil. This statementcan be justified by listing the SIGNIFICANCE of transpiration which out weighs its HARMFUL impacts. Significance of transpiration : (i)Transpiration creates transpiration pull for absorption and transport of water up through the xylem in plants. (ii) It supplies water for photosynthesis. (iii) Ittransportsminerals from the soil to all parts of the plant. (iv)As evaporation causes cooling, transpiration assists in cooling of leaves. Not allthe solar radiationsabsorbed by leaves are used in photosynthesis, but some will cause heating of leaves, Transpiration however reducesthe heating of leaves. (v)Transpiration maintains the shape and structure of the plants by keeping the cells TURGID. (vi)Transpiration removes excess amountof water. Transpiration as evil : (1) Since transpiration involves removal of excess amount of water , it causes flaccidity in cells. (2)At high TEMPERATURE stomatal closure occurs due to transpiration. (3)Plant exhibit wiltingif transpiration exceeds the amount of water absorbed.