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Topic Nervous system
Asked 3 times across 3 UPSC exams over 3 years (2020–2023), peaking in 2020.
Key insights
- Most tested in CAPF — 1 of 3 PYQs
- Most asked in 2020
- Recurs across 3 years (2020–2023)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CAPF 2020 → GEO 2021 → CDS 2023
How the concept evolved
Rising — more than half its appearances (3 of 3) are since 2016.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2023
Reflex arcs are evolved in animals for quick and efficient responses. Which one of the following sequences correctly represents a reflex arc?
- A Receptor—Sensory neuron—Relay neuron in spinal cord—Brain—Motor neuron—Effector ✓
- B Receptor—Sensory neuron—Brain—Relay neuron in spinal cord—Motor neuron—Effector
- C Receptor—Motor neuron—Relay neuron in spinal cord—Sensory neuron—Effector
- D Receptor—Motor neuron—Brain—Sensory neuron—Effector
✓ Correct answer: (A)
Science & Technology › Biology & Health
GEO2021
The cells associated with receiving and conducting impulses are:
- A Neuron
- B Plasma cells
- C Adipocytes
- D Macrophages
Answer key not yet available (pending official release)
Science & Technology › Biology & Health
CAPF2020
In human beings, certain chemicals which cross the synapse between nerve cells are released from
- A cell body of nerve cell
- B nucleus of nerve cell
- C nerve endings of nerve cell ✓
- D axon of nerve cell
✓ Correct answer: (C)
Science & Technology › Biology & Health
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