DP Biology (last assessment 2024)

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Question 22N.2.SL.TZ0.c

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Date November 2022 Marks available [Maximum mark: 3] Reference code 22N.2.SL.TZ0.c
Level SL Paper 2 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
22N.2.SL.TZ0.c

The diagram shows the release of a neurotransmitter across a synapse.

[Source: Splettstoesser T., 2015. SynapseSchematic [diagram online] Available at :
https://commons.wikimedia.org/w/index.php?curid=41349083 [Accessed 14 January 2023].]

Explain the action of neonicotinoid pesticides in insects.

[3]

Markscheme
  1. prevents synaptic/nerve transmission
  2. is /acts like /has similar structure to a neurotransmitter/acetylcholine
  3. (neonicotinoid pesticides) bind to acetylcholine receptors in the post synaptic membrane;
  4. neonicotinoid pesticides are not broken down (as acetylcholine would be) by acetylcholinesterase/enzyme;
  5. the receptors are overstimulated
  6. paralyses/kills the insects;

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