DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.10b

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.sl.TZ0.10b
Level sl Paper 3 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
19N.3.sl.TZ0.10b

Vitamins are organic compounds essential in small amounts.

(b)

Explain the biomagnification of the pesticide DDT.

[2]

Markscheme

accumulates in fat/tissues/living organisms
OR
cannot be metabolized/does not break down «in living organisms»
OR
not excreted / excreted «very» slowly ✔

passes «unchanged» up the food chain
OR
increased concentration as one species feeds on another «up the food chain» ✔

NOTE: Accept “lipids” for “fat”.

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