Question

Assertion : Reflex arc comprises of at least one afferent neuron, one efferent neuron and a part of $PNS$
Reason : The efferent neuron receives signal from a sensory organ and transmits the impulse via a ventral nerve root into the $PNS$

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (D)

The reflex pathway comprises at least one afferent neuron (receptor) and one efferent (effector or excitor) neuron appropriately arranged in a series. The afferent neuron receives signal from a sensory organ and transmits the impulse via a dorsal nerve root into the $CNS$ (at the level of spinal cord). The efferent neuron then carries signals from $CNS$ to the effector. The stimulus and response thus forms a reflex arc