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5.1 - SPECIMEN SET B2 Q3

3) Neurones pass information around the body.
3.1)Why are reflex reactions important? [1 mark]

3.2) Caffeine is a drug found in coffee.
After a person drinks coffee information passes through neurones in the nervous system more quickly.
Suggest a hypothesis for the effect of caffeine concentration on reaction time. [1 mark]

3.3) Two students investigated the effect of caffeine concentration on reaction time. This is the method used.
  1. Student A drinks a cup of coffee.
  2. Student B holds a ruler above Student A’s hand.
  3. Student B drops the ruler.
  4. Student A catches the ruler as quickly as she can.
  5. The distance the ruler falls is recorded.
Suggest how this method could be improved to produce valid results. [6 marks]

​​(Total for Question 3 = 8 marks)