Coordination and control – the nervous system

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Question 16
Medium

The graph shows the relationship between temperature and the speed of nerve impulses in two different species of fish: Species A (adapted to cold water) and Species B (adapted to warm water).

A line graph showing the relationship between temperature in degrees Celsius (x-axis, from 0 to 40) and speed of nerve impulse in metres per second (y-axis, from 0 to 100) for two species of fish. Curve A (Species A, solid line) starts at (0, 10), rises to a peak at (10, 50), and then declines, passing through (20, 40) and ending at (25, 0). Curve B (Species B, dashed line) starts at (10, 5), rises through (20, 40) to a peak of (30, 80), and then declines to (40, 60). The two curves intersect exactly at the point (20, 40).

a.

Complete the sentences using the information from the graph.

Use numbers or words from this list:

10**, 20, 30, faster, slower, negative, positive, **identical

  • For Species A, between 0∘C0^\circ\text{C}0∘C and 10∘C10^\circ\text{C}10∘C, there is a ................................... correlation between temperature and nerve impulse speed.
  • At a temperature of ................................... ∘C^\circ\text{C}∘C, the speed of nerve impulses is the same in both species of fish.
  • At 30∘C30^\circ\text{C}30∘C, the speed of nerve impulses is ................................... in Species B than in Species A.
[3]
b.

In both species of fish, photoreceptors in the eyes are located very close to the brain. Suggest one advantage of this anatomical arrangement.

[2]

Coordination and control – the nervous system Questions

  1. GCSE
  2. /Biology
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