| Date | May 2018 | Marks available | 1 | Reference code | 18M.1.SL.TZ1.2 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 2 | Adapted from | N/A |
Question
Common pesticides used by gardeners contain neonicotinoids.
[Source: © International Baccalaureate Organization 2018]
What is the effect of a neonicotinoid pesticide on the transmission of a nerve impulse between neurons in an insect?
A. It prevents the release of acetylcholine from the presynaptic membrane.
B. It widens the synaptic cleft so diffusion of acetylcholine across the gap is slower.
C. It irreversibly binds with acetylcholine receptors on the postsynaptic membrane.
D. It interferes with the enzymatic breakdown of acetylcholine by acetylcholinesterase.
Markscheme
C
Examiners report
[N/A]
