1. The student made a slide of an onion root tip.She counted the number of cells in each stage of the cell cycle in one field of view. - The table below shows the results. - - There are 20 non-dividing cells - - Stage 1: 9 - Stage 2: 4 - Stage 3: 2 - Stage 4: 1 - - Total: 36 - - Each stage of the cell cycle takes a different amount of time. Which stage is the fastest in the cell cycle? - - Give a reason for your answer.

2. Name the gases involved in photosynthesis and which direction they go.

3. Name the enzyme produced by the salivary glands.

4. Name the organ where the processes shown in the diagram take place.

5. What is hyphae?

6. Explain how water is transported from the soil to the leaves.

7. Describe the change which will occur if a piece of peeled potato is placed in a concentrated sugar solution and explain why this change occurs.

8. What kingdom do Chlorella belong to?

9. Explain how Cell enlargement is part of the growth process of a baby.

10. Explain why stem cells could repair a damaged heart.

11. What is the function of the vacuole in plant cells?

12. How cell C is adapted for producing this enzyme.

13. Which of viruses, bacteria and yeasts are prokaryotic

14. A fertilised egg cell divides many times to form an embryo. Name this type of cell division.

15. What is an invertebrate?

16. Why is cell specialisation (differentiation) important for the development and growth of a healthy baby from a fertilised egg?

17. What word is used to describe plant cells placed in: a hypotonic solution

18. Suggest why the number of cells levels out at Q.

19. State 3 differences between eukaryotic and prokaryotic organisms.

20. Explain the advantages of red blood cells passing through a capillary one at a time.

21. Why is sunlight necessary for photosynthesis?

22. Draw a root hair cell.

23. A cook prepares a fresh fruit salad by cutting up a variety of fruits and placing them in a bowl with layers of sugar in between. After two hours the fruit is surrounded by syrup (concentrated sugar solution). Explain, as fully as you can, why syrup (concentrated sugar solution) was produced after two hours.

24. Describe how the movement of potassium ions into the guard cells causes the stoma to open.

25. Define the term saprotrophic nutrition.