Contraction of the pupil in bright light demonstrates which deeper principle of coordination?
Answer and explanation
Correct answer: Receptors detect a stimulus and effectors produce a controlled response.
Bright light is the stimulus, and light-sensitive receptors in the eye detect its increased intensity. Nervous signals then reach the muscles of the iris, which contract to make the pupil smaller and limit the amount of light entering the eye. This is a coordinated, largely involuntary response, so option A is correct. The other choices confuse reflex coordination with conscious will, hormone action, or blood-glucose regulation.
Frequently asked questions
What is the correct answer to this question?
Receptors detect a stimulus and effectors produce a controlled response.
Why is this the correct answer?
Bright light is the stimulus, and light-sensitive receptors in the eye detect its increased intensity. Nervous signals then reach the muscles of the iris, which contract to make the pupil smaller and limit the amount of light entering the eye. This is a coordinated, largely involuntary response, so option A is correct. The other choices confuse reflex coordination with conscious will, hormone action, or blood-glucose regulation.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
