Gas Exchange and Transport in Plants
1. Where does gas exchange in plants take place?
2. Gas exchange is required for two critical processes – respiration and photosynthesis. Fill
in the following table to summarise these two processes:
Process
Gas In
Gas Out
Time
Equation
Respiration
Photosynthesis
3. What is the process by which gases move in and out of green plants called?
4. What regulates the route of gases in and out of the leaves?
5. What does the xylem of a plant transport? Where from and where to?
6. Describe the structure of the xylem. Explain what the significance of lignin is.
7. What do phloem tubes transport?
8. What is meant by translocation?
9. What is the function of root hairs on root cells?
10. What is the name of the process by which water enters the root?
11. What is transpiration and where in the leaf does it occur?
12. What factors affect the transpiration rate? Describe how a change in each can impact
the rate of transpiration.
13. Fill in the following table to describe why transpiration is important in each function:
Process
Photosynthesis
Cooling
Structure
Movement of Minerals
Significance of Transpiration
This worksheet is provided free of charge by Porridge and Rice, a charity that supports
community schools in the slums of Nairobi, the capital of Kenya. The Porridge and Rice
website is at www.porridgeandrice.co.uk.