DP Biology (last assessment 2024)
Question 18M.3.SL.TZ2.14
| Date | May 2018 | Marks available | [Maximum mark: 4] | Reference code | 18M.3.SL.TZ2.14 |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Discuss | Question number | 14 | Adapted from | N/A |
14.
[Maximum mark: 4]
18M.3.SL.TZ2.14
Discuss the health consequences and environmental consequences of the use of DDT.
[4]
Markscheme
a. DDT is a pesticide/insecticide
b. reduction in disease vectors
OR
reduction in mosquitos carrying malaria
c. leading to a reduction in disease/malaria rates
Accept other diseases such as typhus carried by lice.
d. biomagnification in food chains
e. negative impact on health of top predators / example of top predator
f. thin eggs shells
OR
reduced reproductive success in birds of prey
Examiners report
