Limitless IGCSE Biology
Topic 14.1.2: Reflex Arc - Boss Fight Exam
Total Marks: 43
Covering Papers 2, 4, and 6 • Core & Supplement Material
Section A: Sequence & Structure (Paper 2)
5 Questions • 13 Marks
Arrange the components of a reflex arc in the correct order.
[5 marks]
Use the interactive diagram in Question 3 to visualize the pathway.
Which component of the reflex arc is located entirely within the central nervous system?
[1 mark]
Using the spinal cord cross-section above, click the components in the correct sequence to show the path of a reflex arc.
[5 marks]
DRAWING TASK: Click the components in the correct order (1→2→3→4→5)
Your selected sequence will be numbered. Click again to deselect.
In a reflex arc, where is the synapse between the sensory neurone and relay neurone located?
[1 mark]
Which statement about reflex arcs is correct?
[1 mark]
Section B: Mechanism & Function (Paper 4)
5 Questions • 16 Marks • Theory Questions
Define the term "reflex action".
[3 marks]
Explain why reflex actions are important for survival.
[4 marks]
Describe the role of the relay neurone in a reflex arc.
[3 marks]
Explain why the reflex arc is described as "automatic".
[2 marks]
State TWO differences between a reflex arc and a voluntary action.
[4 marks]
Section C: Experimental Analysis (Paper 6)
5 Questions • 14 Marks • Practical Skills
A student investigates reaction time by dropping a ruler. Describe how this experiment should be carried out.
[5 marks]
State ONE way to make the ruler-drop experiment MORE RELIABLE.
[1 mark]
Explain why we do NOT feel pain until AFTER the hand has moved away from a hot object.
[3 marks]
EXAMINER TRAP:
Students often think there is only ONE impulse. There are TWO pathways: (1) reflex arc to spinal cord (fast), (2) awareness pathway to brain (slower).
A student measures reaction time five times: 180 ms, 175 ms, 220 ms, 178 ms, 182 ms. Identify the anomalous result and calculate the mean of the valid results.
[3 marks]
Data:
Trial 1
180 ms
Trial 2
175 ms
Trial 3
220 ms
Trial 4
178 ms
Trial 5
182 ms
Suggest TWO variables that should be controlled in the ruler-drop reaction time experiment.
[2 marks]
Cambridge Grade Boundaries
A*
90%+
A
80%+
B
70%+
C
60%+
D
50%+
E
40%+
U
0%+
Total Marks: 43 • Based on Cambridge IGCSE Biology 0610 Standards
© 2026 Limitless IGCSE Biology • Syllabus 0610 (2026-2028)
Covering Papers 2, 4, and 6 • Core & Supplement Material
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