O level Biology Factors affecting the rate of Transpiration in plants

Factors affecting the rate of  Transpiration  in plants

Environmental  factors

Light intensity 

High light intensity  increase  the temperature  of cells  of  leafs  .when it absorbs it this enables more  water molecules  to change to vapor hence increasing in transportation . Increase  in light Intensity  also  increase the size of the stomata giving way  to  diffuse  out

      wind :when there is  no  wind rate  of transpiration   decrease the plant  become saturated  with water vapor  .when this happen water vapor  from  the leaf  will not   diffuse outward  hence  stopping transpiration

• Humidity :  when the atmosphere  is fully  saturated with water vapor there is  no  more possibility  for more  water  vapor  to moving to  it  under such  condition therefore  the  plant  can  not give  out  water vapor out.

       Amount of water present In the soil : when the amount  of soil  water is low  the plant  absorbed  low water there by leading to  a  low amount  of water to  be sent  by  the plant

      Temperature : A high temperature increase the capacity  of air  for water vapor  hence  transpiration increase  .

Non Environmental

Stomata :

85% of transpiration  takes place in the stomata , most  stomata  are found in the  lower epidemise  , so  the fewer stomata on the  leafs  of the  plant the  lower the  transpiration rate