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In vertebrates, simple reflex action is

1. polysynaptic
2. bisynaptic
3. trisynaptic
4. monosynaptic

Correct answer: monosynaptic

Solution

A simple reflex action in vertebrates involves a direct connection from the sensory neuron to the motor neuron through a single synapse. Because only one synapse is involved, it is called monosynaptic.

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