Question

State 5 env factors that can affect the rate of transpiration and for each explain how they have their effect.

Accepted Answer

Factors affecting rate of transpiration:Light - required for photosynthesis so stomata will open when there is light - higher rate of transpirationRelative humidity - high humidity lowers rate of transpiration bc reduced water vapour potential gradient between inside leaf and outsideTemperature - increases kinetic energy of water mols so it increases rate of evaporation, also increases conc of water vapor that external air can hold before it becomes saturated - decreaes relative humidity and water potentialAir movement - water vapor that diffuses out accumulates at leaf, air movement ventialtes and increases diffusion Soil water availability - dry soil means plant will draw less water and therefore lower rate of transpiration

Water Rate Transpiration Increases Humidity Air Factors Light