DP Biology (first assessment 2025)

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Question 21N.2.SL.TZ0.1f

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Date November 2021 Marks available [Maximum mark: 2] Reference code 21N.2.SL.TZ0.1f
Level SL Paper 2 Time zone TZ0
Command term Suggest Question number f Adapted from N/A
f.
[Maximum mark: 2]
21N.2.SL.TZ0.1f
(f)

Suggest two abiotic factors, other than temperature and nutrient supply, that may affect the production of biomass of the grasslands.

[2]

Markscheme

a. water availability/rainfall/humidity;
b. light/sunlight (intensity) / daylength;
c. salinity of soil / high/low soil pH;
d. chemical pollution/herbicides/allelopathy/parasitic weeds;

Mark the first two answers only.
Do not accept carbon dioxide or weather conditions.

Examiners report

About half of answers given were accepted. Carbon dioxide concentration was unlikely to vary enough to affect grassland biomass production. Vague answers such as ‘pH’ were not accepted but soil pH was.

Syllabus sections