Edexcel IGCSE Biology Graph Skills
Practise Edexcel IGCSE Biology graph skills by reading values from graphs and tables, describing trends and using graph data in calculations.
- Syllabus
- Issue 3 (2024)
- Course
- Biology 4BI1
Exam points
- Read graph or table values to classify BMI, find impulse speed or calculate sweat volume.
- Describe trends from table data, such as pupil diameter decreasing as light intensity rises.
Covered syllabus points
4 Graphs question 1
Neurones transmit nerve impulses.
The diagram shows a neurone.
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 .
Use the graph to determine the speed of an impulse in this neurone.
speed = m per s
4 Graphs question 2
A student uses this method to investigate the effect of fertiliser on the growth of plant seedlings.
- set up two trays with an equal mass of compost in each tray
- plant 100 seeds, equally spaced, in each tray
- place the trays under the same lamp until the seeds start to germinate
- water each tray every day with the same volume of water
- add fertiliser to one of the trays every day
- remove five seedlings from each tray every four days for a period of 20 days
- dry these seedlings in an oven and find their mass
The table shows the student's results.
Plot a line graph to show the dry mass of seedlings without fertiliser and the dry mass of seedlings with fertiliser, from day 4 to day 20.
Use a ruler to join your points with straight lines.
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