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CAIE A-Level Biology AS and A Level Mathematical Requirements

Practise the calculations embedded across Biology 9700, including units, precision, magnification, geometry, averages, percentages, graphs and rates.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Covered syllabus points

M.1—Prefixes, units, symbols and standard formM.2—Calculator use, estimations and significant figuresM.3—Magnification, actual size and geometryM.4—Averages, ratios, percentages and experimental errorM.5—Graphs, data transformation and rates of change

AS and A Level mathematical requirements question 1

[Maximum number: 2]

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 AS and A Level mathematical requirements question 1 — CAIE A-Level Biology A2

Question (a)

(a)

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:

[ 2 ]

Question (i)

(i)

for the three replicates, the mean time taken for the DCPIP to decolourise

[ 1 ]

Question (ii)

(ii)

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. }
[ 1 ]
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