Reaction time practical (F/H)

GCSE · Biology · AQA · B5.2 — The human nervous system: structure and function, sensory and motor neurones, the CNS, reflex arcs and synapses

Question

(F/H6) A student investigates whether caffeine affects reaction time using the ruler-drop test. Suggest three variables that should be kept the same to make the comparison fair.

[Crossover — 3 marks]

Mark scheme (any 3):

Same person dropping the ruler / same person catching (B1)
Same hand used for catching (B1)
Same starting height / same point of release (B1)
Same posture / arm position (B1)
No warning given before the drop (B1)

3 marks · take your time before peeking.

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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.