DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.13b.ii

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.2.SL.TZ0.13b.ii
Level SL Paper 2 Time zone TZ0
Command term Describe Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 2]
20N.2.SL.TZ0.13b.ii
(b.ii)

Describe how ingested plastics can cause problems to marine birds.

[2]

Markscheme

a. fill up the stomachs (of young birds) so they feel full / starve to death;

b. damage the digestive system / cut the gut/stomach/oesophagus/intestines (leading to internal bleeding);

c. block passage of food (causing starvation);

d. cause choking (so cannot breathe);

e. contain/decompose to toxic chemicals (poisoning birds)
OR
toxins/microplastics in seawater build up/biomagnify (and poison wildlife);

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