Loading...

What is transpirati… - QuestionCove
OpenStudy (anonymous):

What is transpiration? How is it important for plants?

4 years ago
OpenStudy (anonymous):

Definition:- the evaporation of water or loss of water in vapour form, from the exposed parts of a plant especially leaves is termed as transpiration. Advantages of Transpiration:- (1) Ascent of sap:Transpiration developes tension in the water column which makes it possible for the water to rise from the xylem of the roots to the top of the plant. (2) Removal of excess water : Plants absorb far more water than is actully required by the plants.Transpiration helps in removing this excess water. (3) Absorption & distribution of salts: The rate of salt absorption increases with the rate of transpiration. (4) Cooling effect:- Sunlight that falls on the leaf can raises the leaf temprature by 30-40 degree centigrade above the atmospheric temperature,and thus harm the leaf tissues.A major portion of this energy is dissipated by transpiration when the water evaporates leading to a cooling effect.. (5) Development of root system: Transpiration allows extensive development of the root system that supports the heavy aerial growth against storms & allows absorption of mineral salts & water. --------------------------------------… Disadvantages (1) Reduces photosynthesis: Under conditions of water scarcity the rate of photosynthesis decreases. it is due to closure of stomata resulting in non-supply of carbondioxide, & loss of turgidity by the cells. (2) Reduces growth: all expansion & elongation requires turgidity. (3) Reduces yield: Water deficit leads 2 wilting & low gtowth . no new leaves r formed. stems & roots lose their meristematic activity. (4) Fall in metabolism: The protoplasm requires a certain optimum hydration for maximum efficiency. As the advantages are more than the limitations Transpiration is rightly called as 'The necessary Evil'

4 years ago
Similar Questions: