DP Chemistry (last assessment 2024)
Question 19N.3.hl.TZ0.b
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.3.hl.TZ0.b |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
19N.3.hl.TZ0.b
Changes in physiology can impact living creatures.
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”.
