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CAIE A-Level Biology A2 P5.4 Dealing with Experimental Data Questions

Use these questions to turn measurements into rates with correct working and units, then plot every value accurately and extend a curve only where the data justify it.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • Calculate rates or mean rate changes from experimental data, showing the data operation and reporting suitable units and precision.
  • Plot quantitative data accurately, draw an appropriate best-fit curve and extend it only with a trend supported by the observed pattern.

CAIE A-Level Biology A2 P5.4 Dealing with Experimental Data Questions question 1

[Maximum number: 1]

The light dependent stage of photosynthesis in a suspension of isolated chloroplasts can be investigated using the Hill reaction.

Dichlorophenolindophenol (DCPIP) can be used to follow the process. DCPIP is a blue dye which turns colourless when it is reduced by accepting hydrogen and electrons.

 oxidised DCPIP → reduced DCPIP  blue → colourless \begin{array}{clc} \text { oxidised DCPIP } & \rightarrow & \text { reduced DCPIP } \\ \text { blue } & \rightarrow & \text { colourless } \end{array}

Table 2.1 shows the results of the experiment.

Table 2.1

Table 2.1

Complete Table 2.1 by calculating the rate of the light dependent stage of photosynthesis for the orange wavelength, using the formula:

 rate =1000t where t= time in seconds. \text { rate }=\frac{1000}{t} \text { where } t=\text { time in seconds. }
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