transpiration first increases and then decreases with the increase in speed.why?

 transpiration first increases and then decreases with the increase in speed.why?


2 Answers

Umakant biswal
5359 Points
5 years ago
@ gayathri 
transpiration process is affecetd by multiple factors , that is wind speed , temp , sunlight , humidity , etc .. now as far as wind speed is concerned , 
transpiration relies on diffusion , windy conditions cause the air molecule to blown away from the leaves preventing the air around the leaves becoming saturated with water molecules , 
dolly bhatia
200 Points
5 years ago
If plant A experiences a greater wind speed than plant B, then plant A will have higher rate of transpiration than plant B because wind brings away humid air around the leaf and decreases water potential, which increases rate of evaporation. Transpiration is a process in which plant transport water from root to leaf and loses water from its stomata. Transpiration helps plant by moving water and dissolved by moving water and dissolved minerals in xylem with upward force result from a combination of adhesion, cohesion, osmosis and atmospheric pressure. Cohesion of water molecules connects them to one another because of hydrogen bond formation. Adhesion is water molecules forming hydrogen bond to wall of xylem cells which offsets downward pull of gravity.
Rate of transpiration is important because water is used in photosynthesis to synthesize sugar, which provides energy and material for maintenance, growth, repair, reproduction and structure.
 Greater the size of the plant, the higher is rate of metabolism because more cells mean more metabolism. Rate of transpiration is correlated with growth rate and environment that plant is adapted to.
Increased light, wind and heat all increase rate of transpiration. Decreased heat and light would decrease transpiration.
Increased wind has greatest effect on increasing rate of transpiration followed by decreased heat. The increased light has greatest effect on decreasing rate of transpiration followed by decreased heat. Wind increases transpiration because it increases rate of movement of water vapour from leaf creating greatest suction and causing plant to transpire more rapidly.
The decrease of heat increases the rate of transpiration. This appears to be because a plant will not need to keep their stomata closed in a cold climate because the water will not evaporate as quickly as it would if the heat was increased. The increasing of the heat has the effect of decreasing transpiration because the stomata of the plant will stay as closed as possible in order to store the water and not lose it through evaporation The increasing of the light has the greatest effect on decreasing the transpiration.
The increase in wind speed does increase the transpiration as expected. The increase of light is supposed to cause an increase in photosynthesis and thereby an increase in transpiration  but it decreases transpiration rates. The increase in light does not increase the transpiration as expected. The decrease in heat increased the transpiration rate which is also not expected. This is due to the stomata opening and closing as a result of the temperature increasing the rate of transpiration.

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