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CAIE A-Level Biology Mathematical & Statistical Skills

Practise the calculations, graph interpretation and statistical decisions required across CAIE A-Level Biology investigations.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Covered syllabus points

AS and A Level mathematical requirementsA Level only mathematical and statistical requirementsA Level formula reference and statistics notes

Mathematical and statistical skills 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 Mathematical and statistical skills 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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