DP Biology (last assessment 2024)
Question 17N.3.SL.TZ0.12c
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.SL.TZ0.12c |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
17N.3.SL.TZ0.12c
(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]
