DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ1.b

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Date May 2023 Marks available [Maximum mark: 3] Reference code 23M.2.SL.TZ1.b
Level SL Paper 2 Time zone TZ1
Command term Suggest Question number b Adapted from N/A
b.
[Maximum mark: 3]
23M.2.SL.TZ1.b

Suggest reasons for the differences in LAI between the boreal and equatorial zones.

[3]

Markscheme
  1. climate/temperature/light consistent throughout year in equatorial but seasonal variation in boreal;
  2. conditions suitable for photosynthesis throughout the year in equatorial but not in boreal;
  3. temperatures higher/growing season longer in equatorial versus lower/shorter in boreal;
  4. water frozen/unavailable in boreal during winter whereas always available in equatorial;
  5. shorter daylengths in winter in boreal (than those months in equatorial so lower LAI);
  6. boreal LAI higher (than equatorial) in July due to longer daylengths;
  7. equatorial trees/plants are evergreen / boreal trees/plants are deciduous/have less/no leaves in winter;
  8. variation in angle of light rays (between different latitudes);

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