A person's pupil contracts in bright light and dilates in darkness. What is this the best example of?
Answer and explanation
Correct answer: Coordinated nervous response between receptor and effector
This situation illustrates nervous coordination. Photoreceptors detect the intensity of incoming light, sensory information is processed through the nervous system, and signals reach the muscles controlling the iris. Those muscles alter pupil diameter: contraction limits excess light and dilation permits more light in darkness. Thus option A is correct. Option B concerns endocrine regulation, while C and D describe plant responses unrelated to the pupil.
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What is the correct answer to this question?
Coordinated nervous response between receptor and effector
Why is this the correct answer?
This situation illustrates nervous coordination. Photoreceptors detect the intensity of incoming light, sensory information is processed through the nervous system, and signals reach the muscles controlling the iris. Those muscles alter pupil diameter: contraction limits excess light and dilation permits more light in darkness. Thus option A is correct. Option B concerns endocrine regulation, while C and D describe plant responses unrelated to the pupil.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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