Edexcel IGCSE Biology Graphical and Numerical Forms

Practise Edexcel IGCSE Biology graphical and numerical forms by reading graph values, using table categories and describing biological trends.

Exam points

Use graph readings to find biological values such as impulse speed or sweat release rate.
Use table categories or data trends to classify BMI or describe pupil diameter changes.

[Maximum number: 1]

Neurones transmit nerve impulses.
The diagram shows a neurone.

Figure for Question 4A Graphical and numerical forms question 1 — Edexcel IGCSE Biology

Some neurones do not have a myelin sheath.

A scientist investigates the impulse speed for neurones with different diameters. She does this for neurones with a myelin sheath and neurones without a myelin sheath.

The graph shows the scientist's results.

Impulse speed in m per s

A neurone with a myelin sheath has a diameter of $1.0 \mu \mathrm{~m}$ .

Use the graph to determine the speed of an impulse in this neurone.
speed = m per s

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4A Graphical and numerical forms question 1