Transpiration

What is transpiration?

The loss of water vapor from the leaves of plants.

What are stomata?

Pores in the underside of the leaf which facilitate gas exchange.

What enters and exits through the stomata during gas exchange?

Carbon dioxide enters; water and oxygen exit.

What properties of water support transpiration?

Cohesive and adhesive properties generate the forces needed.

Is transpiration a passive process?

Yes

Factors that effect the rate of transpiration

• temperature

• humidity

• light intensity

• wind exposure

What effect does increasing temperature have on the rate of transpiration?

Increasing ambient temperature increases the rate of transpiration.

Increasing temperature

Increases the rate of water evaporation

How does humidity affect the rate of transpiration?

Increasing humidity decreases the rate of transpiration

Increasing humidity

Reduces the concentration gradient

What impact does light intensity have on the rate of transpiration?

Increasing light intensity increases the rate of transpiration.

Increase light intensity

More stomata will open in order to facilitate photosynthetic gas exchange

Why does wind exposure affect the rate of transpiration?

Increasing wind exposure increases the rate of transpiration

Increasing wind exposure

Increases the concentration gradient