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CAIE A-Level Biology M.5 Graphs, Data Transformation and Rates of Change

Practise choosing and constructing biological graphs, translating between data forms and extracting average or instantaneous rates from gradients and tangents.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

M.5—Graphs, data transformation and rates of change 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.

Figure for Question M.5—Graphs, data transformation and rates of change question 1 — CAIE A-Level Biology A2

An experiment was carried out to measure the time taken for decolourisation of DCPIP mixed with a suspension of chloroplasts.

The results are shown in Table 2.1.

Table 2.1

Table 2.1

Complete Table 2.1 by calculating:

the mean rate 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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