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(a) (i) Think about the hazards of using the materials in Table 1.1.
State whether you think the risk of using the materials is low, medium or high.
Give a reason for your answer.
risk...........................................................
reason...........................................................
(a) (ii) Record in (a)(ii) the volume of P added.
Record your results in an appropriate table.
(a) (iii) State the independent variable in this investigation.
(a) (iv) Use your results in (a)(ii) to suggest an optimum pH for catalase in this plant extract.
Give a reason for your answer.
optimum pH........................................................
reason........................................................
(a) (v) Identify one source of error in this investigation.
Explain why this is a source of error.
source of error........................................................
explanation........................................................
(a) (vi) Suggest how you would make improvements to this investigation in order to obtain a more accurate estimate of the optimum pH for catalase in this plant.
................................................................................
................................................................................
................................................................................
(b) (i) Plot a graph of the data in Table 1.2 on the grid in Fig. 1.3.
Use a sharp pencil for drawing graphs.
(b) (ii) Use your graph in Fig. 1.3 to determine the volume of oxygen produced when the temperature is 29.5°C.
Show on your graph how you determined your answer.
volume of oxygen = .....................................
(b) (iii) Suggest an explanation for the results between 20.0°C and 60.0°C.
........................................................
........................................................
........................................................
(b) (iv) Suggest an appropriate control the student could have used for this investigation.
........................................................
600
554
578
J1 is a slide of a stained transverse section through a plant root.
You are not expected to be familiar with this specimen.
Use a sharp pencil for drawings.
You are expected to draw the correct shape and proportions of the different tissues.
(a) (i) Draw a large plan diagram of the whole root.
Use one ruled label line and label to identify the epidermis.
[Image: J1]
(ii) Observe the cells in the cortex of the root on J1.
Select four adjacent, touching cells which show observable features of the cortex tissue.
Each cell must touch at least two other cells.
Make a large drawing of this group of four touching cells.
Use one ruled label line and label to identify the cell wall of one cell.
[Image: J1]
(b) Fig. 2.1 is a photomicrograph of a stained transverse section through a root of a different type of plant.
You are not expected to be familiar with this specimen.
[Image: Fig. 2.1]
(i) Annotate Fig. 2.1 to describe three observable differences between the root in Fig. 2.1 and the root on J1.
• Draw label lines to three features of the root in Fig. 2.1 that are different from the root on J1.
• Label one line Q, label one line R and label one line S.
• Next to each letter, describe how each feature of the root in Fig. 2.1 differs from the root on J1.
(ii) Use the scale bar and the line Z on Fig. 2.1 to calculate the actual width of the root.
Show all the steps in your working and use appropriate units.
actual width of the root = .............................................
526
513
538
