Transpiration

Question 1

Transpiration

Answer 1

plants require CO2 for photosynthesis. This enters through the stomata. The stomata can be closed or open. This is controlled by the guard cells found on either side of the stoma. When the guard cells are full of water, they cause the stomata open and when they lose water they shrink in size and cause the stomata close. The guard cells control gas exchange when the stomata open CO2 goes in which is used in photosynthesis O2 is made during this process and diffuses back out the leaf. Water vapour also leaves through open pores.
Water loss through the stomata= transpiration


Question 2

Factors affecting the rate of transpiration

Answer 2

The higher the light intensity the quicker, the rate of transpiration
The higher the temperature, the higher the rate of transpiration
The less humid, the quicker, the transpiration rate
The windier, it is the quicker the rate of transpiration


Question 3

Plants defence against transpiration

Answer 3

Waxy cuticle- waterproofs the leaf
Wilting- reduces the surface area for transpirations
Closing the stomata- prevents water loss, but also prevents photosynthesis