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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.

Related tags

Control-And-CoordinationNervous-SystemPupil-ResponseControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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