Transpiration

What transport processes occur at the yellow, elongated cell?

• Diffusion

• Circulation

• Osmosis

• Active Transport

Gaseous substances enter and exit the leaf by diffusing through the...

• Guard cells

• stomata

• air spaces

• spongy mesophyll

The movement/flow of water up the xylem is called:

• osmosis

• transpiration pull

• transpiration stream

• diffusion

Factors affecting transpiration - humidity (amount of water vapour in the atmosphere) - Suggest the main reason humidity impacts the rate of transpiration.

• Influences diffusion of H₂O by affecting the length of diffusion pathway.

• Influences diffusion of H₂O by affecting the surface area for diffusion.

• Influences diffusion of H₂O by affecting the concentration gradient.

• Impacts enzyme activity.

Increasing the temperature increases rate of transpiration because:

• Enzymes function more closer to the optimum temperature.

• Molecules have more kinetic energy to diffuse quicker.

• Enzymes denature impacting the opening and closing of guard cells.

• Water will evaporate quicker at increasing temperature.

Less windy days decreases the rate of transpiration because:

• The concentration gradient is steeper.

• The concentration gradient is more gentle.

• Less molecules are sent away, meaning there is a relatively high concentration outside the leaf.

• Molecules are in low concentration outside the leaf.