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Solution


Q.

Which among them is a reflex action
1 Sensory neuron – Motor neuron – Relay neuron  
2 Motor neuron – relay – Motor neuron  
3 Sensory – relay – motor neuron  
4 Relay – Motor – Sensory  

Ans.

(3)

When a receptor is triggered, it sends a signal to the brain, which coordinates the response. However, sometimes a speedy response is required that does not need the use of the brain. This is referred to as a reflex action. In a simple reflex action: Sensory neuron -> Relay Neuron -> Motor neuron.