If the sensory nerve is normal but the motor nerve is damaged in a reflex arc, what is the most likely result?
Answer and explanation
Correct answer: The stimulus will be detected, but the command will not properly reach the effector
A reflex arc normally follows the path receptor → sensory neuron → spinal cord or relay centre → motor neuron → effector. A functioning sensory nerve can carry information from the receptor to the spinal cord, so detection is possible. However, a damaged motor nerve cannot transmit the outgoing command to the muscle or gland. Hence A is correct; B describes sensory damage, and C and D are biologically impossible.
Frequently asked questions
What is the correct answer to this question?
The stimulus will be detected, but the command will not properly reach the effector
Why is this the correct answer?
A reflex arc normally follows the path receptor → sensory neuron → spinal cord or relay centre → motor neuron → effector. A functioning sensory nerve can carry information from the receptor to the spinal cord, so detection is possible. However, a damaged motor nerve cannot transmit the outgoing command to the muscle or gland. Hence A is correct; B describes sensory damage, and C and D are biologically impossible.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
