DP Biology (first assessment 2025)

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Question SPM.2.HL.TZ0.9a

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Date May Specimen-2023 Marks available [Maximum mark: 4] Reference code SPM.2.HL.TZ0.9a
Level HL Paper 2 Time zone TZ0
Command term Describe Question number a Adapted from N/A
a.
[Maximum mark: 4]
SPM.2.HL.TZ0.9a
(a)

Describe how toxins such as DDT might concentrate in the bodies of birds.

[4]

Markscheme
  1.  some toxins/DDT are persistent/degrade slowly (once released into the environment);
  2.  (some toxins/DDT) enter the food chain through producers/lower trophic levels;
  3.  (some toxins/DDT) are passed on to higher trophic levels in the food chain;
  4.  (they are) difficult to excrete / are not excreted;
  5.  (they) accumulate in fatty tissues of animals;
  6.  higher trophic levels/top consumers have higher/the highest concentration of pesticides in their bodies;
  7.  they bioaccumulate/biomagnify;

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