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: 2] Reference code 23M.2.SL.TZ1.b
Level SL Paper 2 Time zone TZ1
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
23M.2.SL.TZ1.b

Explain the change in numbers of the cactus moth throughout the study period.

[2]

Markscheme
  1. (before 2002) the cactus moth had abundant food so the population grew exponentially;
  2. (after 2002) the population size fell as the amount of cactus plants decreased
    OR
    from 2003 low population of moths corresponds with low number of cladodes/cactus plants;

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