DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ1.ii

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Date May 2023 Marks available [Maximum mark: 0] Reference code 23M.2.SL.TZ1.ii
Level SL Paper 2 Time zone TZ1
Command term Question number ii Adapted from N/A
ii.
[Maximum mark: 0]
23M.2.SL.TZ1.ii

Global ecosystem modelling suggests that most of the change in LAI is due to increases in atmospheric carbon dioxide. Explain how rising atmospheric carbon dioxide (CO2) concentration could cause the observed change in LAI.

Markscheme
  1. more photosynthesis (with higher carbon dioxide concentration);
  2. more plant growth/more (plant) biomass/more leaves/more plants;

If the answer focuses on greenhouse effect or global warming, do not award mpa, but mpb can be awarded if one of the alternatives is included in the answer.

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