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Question 20N.3.SL.TZ0.14b

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.3.SL.TZ0.14b
Level SL Paper 3 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 1]
20N.3.SL.TZ0.14b

The table shows the number of crabs found in two rockpools by the coast. There were 16 crabs in total in each rockpool.

[Source: © International Baccalaureate Organization 2020.]

(b)

Calculation of Simpson’s reciprocal diversity index for both rockpools gives the following results.

Outline what conclusion can be drawn from the results.

[1]

Markscheme

B is more diverse/biodiverse than A;

Accept vice-versa. Do not accept greater Simpson’s reciprocal diversity index.

Examiners report

The conclusion from the table showing values of Simpson’s reciprocal diversity index required mention of biodiversity, not simply that one pool is more diverse.

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