Question detail
How does the iris respond in low light conditions?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The human nervous system
Question
- A. It contracts to make the pupil smaller
- B. It relaxes to make the pupil larger
- C. It changes color
- D. It remains unchanged
Answer
The correct option is It relaxes to make the pupil larger. This answer is correct because it matches the approved learning objective to describe the iris as the coloured part of the eye that controls the diameter of the pupil in the subtopic The eye (biology only).
Explanation
The correct option is It relaxes to make the pupil larger. It relaxes to make the pupil larger is correct because it directly supports the approved learning objective to describe the iris as the coloured part of the eye that controls the diameter of the pupil. This belongs to the subtopic The eye (biology only) within The human nervous system, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from The eye (biology only).
Common mistake
Misunderstanding the Iris Function
Students often describe the iris as simply the colored part of the eye without mentioning its role in controlling the diameter of the pupil.
Emphasize that the iris not only provides color but also regulates the amount of light entering the eye by adjusting the size of the pupil.
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