DP Biology (first assessment 2025)

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Question 21N.2.SL.TZ0.b.i

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Date November 2021 Marks available [Maximum mark: 2] Reference code 21N.2.SL.TZ0.b.i
Level SL Paper 2 Time zone TZ0
Command term Describe Question number b.i Adapted from N/A
b.i.
[Maximum mark: 2]
21N.2.SL.TZ0.b.i

Describe the evidence that is provided by the data in the table for the harmful effects of rising sea temperatures on corals.

[2]

Markscheme

a. effects (generally) increase with temperature anomalies/WSSTA;
b. effects increase for all different coral covers
OR
in the 25-49 cover there is an anomaly/is not an increasing trend;
c. harmful effect is higher in coral covers between1 50-75 % / vice versa;

Examiners report

In 1b many just described the incidence at various points, instead of stating that there was no clear trend. There were a few G2 comments that the map did not include compass points, which, perhaps, has some justification. However, by convention maps are usually shown with North at the top.

The expression ‘coral cover’ did confuse some of the weaker students who imagined that the corals somehow has a sort of cover over them. Most students gained at least 1 mark in 1b (i), despite the criticism from the G2 forms that it was very complex.

Syllabus sections