Why is the pupil of the human eye black?
Correct answer: C. The pupil is a hole that allows light to enter but the light is either absorbed or diffused within the eye before it can exit
- A. The pupil is made up of proteins that are pigmented to appear to give a black appearance
- B. The pupil can be of any color, not necessarily black
- C. The pupil is a hole that allows light to enter but the light is either absorbed or diffused within the eye before it can exit
- D. The vitreous humor behind the pupil is black in color which gives the transparent pupil a black appearance
Explanation
The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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