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Question 17N.3.SL.TZ0.c

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.3.SL.TZ0.c
Level SL Paper 3 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
17N.3.SL.TZ0.c

Explain how pesticides may undergo biomagnification in the lake.

[2]

Markscheme

a. the increase in concentration of the pesticide at higher trophic levels

b. taken in by organisms low in the food chain

c. cannot be excreted so remains in tissues

    OR

    accumulates as more organisms from lower levels are eaten

d. pesticides do not degrade/degrade very slowly

[Max 2 Marks]

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