A scenario question gives you a short story and asks for the science behind it. Use the numbers and words in the story, name the coordination idea, and stop short of saying what is wrong with anyone.
This lesson is part of SPM Science body coordination. It uses the chain from tracing a simple response pathway.
What does a scenario question actually test?
It tests whether you can link an observation to a coordination concept. The story is the evidence, and the syllabus concept is the explanation.
Use three steps.
- Underline the measurement or observation.
- Name the concept it points to, such as response speed or the role of the nervous system.
- Write the assumption that makes the comparison fair.
Worked example: the falling ruler
Hafiz holds a ruler at the top while Ling Yi places her thumb and finger at the zero mark. Hafiz lets go without warning and Ling Yi catches it. The distance the ruler fell is recorded.
| Trial | Condition | Distance fallen (cm) |
|---|---|---|
| 1 | After resting for 5 minutes | 14 |
| 2 | After 10 minutes of a phone game | 19 |
Question: What can you conclude about Ling Yi’s response in trial 2? (3 marks)
Model answer. The ruler fell 5 cm further in trial 2 (19 − 14 = 5). A longer distance means the catch happened later, so her response was slower in trial 2. The signal from the eyes to the brain and on to the hand muscles took longer.
This assumes the same person, the same release method and one trial per condition.
Notice what the answer leaves out. It does not say Ling Yi is tired or has a condition. One pair of readings cannot show why the response changed.
The mistake that costs marks
A student writes “Ling Yi has poor nerves”. The sentence sounds scientific, but it is a judgement about a person with no support in the table.
| Diagnosis answer | Curriculum answer | |
|---|---|---|
| Uses the data | No | Yes, 19 cm against 14 cm |
| Names the concept | “poor nerves” | slower response time |
| Marks out of 3 | Little or none | Full |
The fix is to ask one question before writing: which number in the story am I explaining?
Check yourself
A class repeats the ruler test three times for one student: 12 cm, 13 cm, 11 cm. Another student records 12 cm once. State the average for the first student and one reason the comparison between the two students is weak.
Answer
The average is (12 + 13 + 11) ÷ 3 = 36 ÷ 3 = 12 cm.
The comparison is weak because the second student has a single reading, so it cannot show whether 12 cm is typical. It also assumes both students used the same release method and hand.
What to study next
Practise the skill on mixed questions in the body coordination practice set. When you check a graph in a scenario, the graph evidence comparison lab helps you practise spotting what makes a comparison fair.
For a teacher to go through your scenario answers, see online one-to-one Science tuition.