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Question 18M.3.SL.TZ2.b.iii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ2.b.iii
Level SL Paper 3 Time zone TZ2
Command term Describe Question number b.iii Adapted from N/A
b.iii.
[Maximum mark: 2]
18M.3.SL.TZ2.b.iii

The graph shows the energy consumption of photoreceptors in three different species of fly (Drosophila melanogaster, Drosophila virilis and Sarcophaga carnaria) at the mean of the highest transmission rate for each species at rest and while sending a nerve signal (signalling).

Describe the relationship between energy consumption and transmission rate.

[2]

Markscheme

a. energy consumption increases from rest to signalling «in all three species» 

b. faster transmission consumes more energy
OR
positive correlation 

c. doubling of transmission rate requires more than double the increase in energy consumption
OR
exponential increase
OR
the higher the energy consumption at rest, the higher the energy consumption at signalling

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