DP Biology (first assessment 2025)

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Question 22M.1A.SL.TZ2.17

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1A.SL.TZ2.17
Level SL Paper 1A Time zone TZ2
Command term Question number 17 Adapted from N/A
17.
[Maximum mark: 1]
22M.1A.SL.TZ2.17

A group of students used quadrat sampling to gather data on the presence of two plant species in an area. They performed a chi-squared test to assess whether the distribution of the two species was associated. The calculated value of the chi-squared test was below the critical value. What can be deduced from the results of the chi-squared test?

A. The alternative hypothesis is accepted.

B. The distribution of one species is independent from the other.

C. Both species are evenly distributed in the grassland ecosystem.

D. The distribution of both species is correlated with abiotic factors.

[1]

Markscheme

B

Examiners report

This apparently straightforward question did not discriminate as well as expected with many candidates opting for response A.

Syllabus sections