1. Skill Set 1: Performing & Observing 1.1 Demonstrating experimental techniques 1.2 Making observations and measurements 1.3 Presenting data

2. 1.1 Demonstrating experimental techniques

3. (1) Able to cut different strips of potato tissues of equal length using a ruler.

4. (2) Add sufficient sucrose solution to completely submerge the potato strips.

5. (3) Blots potato using dry paper towels before putting them into solutions

6. (4) Perform experiment safely and without assistance.

7. Do this demonstrate good experimental techniques?

8. 1.2 Making observations & measurements

9. What’s wrong with this experimental skill?

10. Blot dry first before taking measurement

13. 1.3 Presenting data

14. Concentration of salt solution/ mol per dm 3 Original length / mm Final length / mm Change in length / mm Average change in length / mm Percentage change in length / % 0.2 0.8 * Table must have headings and correct units

15. Skill Set 2: Analysing 2.1 Processing data 2.2 Drawing conclusions

16. 2.1 Processing data - calculations - graph plotting ( axis-x and y must be labelled, appropriate scales, correct points)

17. Concentration of salt solution/ mol per dm 3 Original length / mm Final length / mm Average change in length / mm Change in length / mm Percentage change in length / % 0.260 62 63 62.5 + (1 d.p) + (1 d.p) + (1 d.p) 0.860 57 55 56.0 - (1 d.p) - (1 d.p) * Table must have accurate calculations and negative sign (-) for decrease in length positive sign (+) for increase in length * Table must have accurate calculations and negative sign (-) for decrease in length positive sign (+) for increase in length

18. 2.2 Drawing conclusions

19. Able to estimate the concentration of cell sap of potato tissue from the graph correctly.Able to estimate the concentration of cell sap of potato tissue from the graph correctly. Identifies key source of errors in experiment and how it affects the results. Identifies key source of errors in experiment and how it affects the results.