A student catches a falling ruler. The mean distance fallen decreases from 24 cm to 18 cm after five practice attempts. Which conclusion is best supported by these results?
Practice increased the response distance, so the strength of every muscle contraction in the hand increased.
Practice reduced the response distance, so the speed of every impulse in the nervous system increased.
Practice increased the response distance, but the reaction time cannot be compared without measuring mass.
Practice reduced the response distance, but the reaction time cannot be compared without repeated measurements.
40 exam-style questions on AQA GCSE Biology 5.2 The human nervous system, covering 5.2.1 Structure and function, 5.2.2 The brain, 5.2.3 The eye, and 5.2.4 Control of body temperature. Each one has a worked solution and a mark scheme showing where the marks go.