Q1. [1] § 6.1 ANIMALS – NERVOUS SYSTEM § 6.1.1 What happens in Reflex Actions?
The correct sequence of events that occur when a person unknowingly touches a hot object is :
- (A) Receptors in skin → Relay neuron → Sensory neuron → Motor neuron → Effector muscle in arm
- (B) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron → Effector muscle in arm
- (C) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron → Effector muscle in arm
- (D) Receptors in skin → Sensory neuron → Motor neuron → Relay neuron → Effector muscle in arm
Previously asked in CBSE board exam
2024 31/5/1 Q7
Generated by claude-sonnet-4-6 · 2026-06-15 06:49 · grounding rag
Model Answer
(B) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron → Effector muscle in arm
Explanation
This is a reflex arc. The correct order is: receptor detects stimulus → sensory neuron carries impulse to spinal cord → relay neuron (in spinal cord) connects them → motor neuron carries impulse to muscle → effector responds. Options (A) and (D) have incorrect sequences; (B) and (C) appear identical — (B) is the standard correct answer. Source: Chapter 6, Section 6.1.1.
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