Question Constellation Sign up for free AQA · GCSE · Biology · Higher
Controls in the Bread Investigation
A student investigated three types of bread. For each type of bread, the student:
- put a square piece of bread into their mouth
- did not chew the bread
- recorded the time taken for the bread to taste sweet
Table 2 shows the results.
| Type of bread | Time taken for bread to taste sweet in seconds |
|---|---|
| Brown | 43 |
| White | 35 |
| Wholemeal | 57 |
Give one control variable the student should have used in the investigation.
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Marking points
- 1 Gives one accepted variable that should be controlled.
Full-mark answer
Use the same mass of bread for every type.
Why this answer loses marks
Use the same student.
The mark scheme explicitly ignores this because it is not a credited control for this investigation.