Which sequence of message flow in a reflex arc is correct?
Answer and explanation
Correct answer: Receptor then sensory nerve then spinal cord then motor nerve then effector
The governing concept is the direction of information flow in a reflex arc. A receptor first detects the stimulus. The sensory nerve carries the impulse to the spinal cord, which coordinates the rapid response; a motor nerve then carries the command to the effector, such as a muscle. Thus A gives the correct sequence. The other options reverse stages or incorrectly insert blood, hormones or an unsuitable order.
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What is the correct answer to this question?
Receptor then sensory nerve then spinal cord then motor nerve then effector
Why is this the correct answer?
The governing concept is the direction of information flow in a reflex arc. A receptor first detects the stimulus. The sensory nerve carries the impulse to the spinal cord, which coordinates the rapid response; a motor nerve then carries the command to the effector, such as a muscle. Thus A gives the correct sequence. The other options reverse stages or incorrectly insert blood, hormones or an unsuitable order.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Reflex action.
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