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ACTUAL OCR 2024 OCR AS Level Biology A May-June 2024 Question Paper 2 WITH MARK SCHEME
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ACTUAL OCR 2024 OCR AS Level Biology A May-June 2024 Question Paper 2 WITH MARK SCHEME
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1
(a) Students used a transect line to sample species of wildflowers in a field.
(i) Name the type of sampling method used in a transect line.
..................................................................................................................................................... [1]
(ii) This table shows their findings.
Number of
Species organisms n/N (n / N)2
(n)
Foxglove 3 0.13 0.02
Meadow buttercup 7
Oxeye daisy 9
Yellow rattle 4
N= ∑(n / N)2 =
1 – ∑(n / N)2 =
Calculate the Simpson’s Index of Diversity for the field using the data in the above table.
Use the formula: D = 1 – d∑b l n
n 2
N
Give your answer to 2 significant figures.
Simpson’s Index of Diversity = .......................................................... [3]
(iii) State what can be concluded about the diversity of the field from your answer in (a)(ii).
..........................................................................................................................................................
..................................................................................................................................................... [1]
© OCR 2024
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, 3
(b) The students then used a sweep net to sample animals in two different parts of a river.
They did this by holding the sweep net in the water and at the same time kicking the riverbed
downstream.
Suggest how they could improve their sampling method to obtain more valid results.
..........................................................................................................................................................
..................................................................................................................................................... [1]
(c) Black oak trees are an example of a keystone species within an oak woodland ecosystem in
England.
Suggest what would happen to the ecosystem if the black oak trees died out.
..........................................................................................................................................................
..................................................................................................................................................... [1]
© OCR 2024 Turn over
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