DP Biology (first assessment 2025)

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Question 19M.2.SL.TZ2.f

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.SL.TZ2.f
Level SL Paper 2 Time zone TZ2
Command term Deduce Question number f Adapted from N/A
f.
[Maximum mark: 2]
19M.2.SL.TZ2.f

Deduce whether there is a correlation between the neural traces and the percentage of responding G1 neurons.

[2]

Markscheme

a. there is a positive relationship/correlation between the size of neural traces and the percentage of responding G1 neurons Accept vice versa
OR
the chemicals that cause stronger/higher neural traces also cause the greatest percentage of responding G1 neurons ✔

b. fox and stoat scents have «approximately» the same/similar neural traces and the same percentage of responding neurons/>75 % ✔

c. mouse alarm compounds cause smaller neural traces and smaller percentage of responding neurons/25–75 % ✔

d. control chemicals have no response in both cases
OR
no percentage of «G1 neurons» response and no action potential «in neural traces» ✔

Examiners report

Similarly, in 1f most could see the positive correlation, albeit not stating it, between the size of the trace and the percentage of responding G1 neurons.