Question

Describe the factors that affect the rate of transpiration in green plants

Answer 1

Rate of transpiration can be affected by 


External factors :


Temperature 

Humidity 

light 

Wind current 



Internal factors :

Number of stomata 

Arrangement of stomata 

water status 

Canopy structure 

Answer 2

NCERT based Answer for Class 11 Biology Students

Factors affecting transpiration:

 If humidity is high, water is lost slowly into the air as a result rate of transpiration decreases.

 The rate of evaporation doubles with every rise in temperature by 10°C.

 High temperature, influencing closure of stomata, reduces transpiration.

 High wind speed or dry air greatly increases transpiration.

 Leaf with larger surface area transpires more water into the atmosphere.

 Needle shaped leaves of the plants in temperate regions reduce rate of transpiration.

 Leaves of desert plants have thick cuticle and sunken stomata (deep–seated) to cut down loss of water through transpiration.

 Stomata close in water stressed plants to reduce rate of transpiration.

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