Diffusion, Osmosis and Active Transport
1. What type of energy do particles in liquids and gases possess?
2. What is a concentration gradient?
3. Define diffusion
4. What two factors affect the rate of diffusion?
5. Explain the role of the stomata in diffusion in plant cells
6. Give an example of diffusion in human body cells
7. What is meant by a “partially (or selectively) permeable” membrane?
8. Define osmosis
9. What is haemolysis?
10. How do plants use osmosis to take up water?
11. What is meant when a cell is described as being turgid?
12. What is meant when a cell is described as being flaccid?
13. What is plasmolysis?
14. Define active transport
15. What is the role of mitochondria in active transport?
16. Give an example of something that is taken up in plants via active transport
17. Where in the human body, during digestion, does active transport take place and
how?
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.