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Practise 29 exam-style questions on The eye (biology only) for AQA GCSE Biology. Write your answer as you would in the exam and get it marked in seconds against the mark scheme, point by point, with an AI tutor on hand if you get stuck.
Here are 4 of the questions in this topic, each with a model answer, an explanation of why it earns the marks and the mark scheme an examiner would use.
What is the name of the transparent front part of the eye that refracts light?
cornea
The cornea is the clear, curved front surface of the eye that does most of the bending (refraction) of incoming light.
cornea
State one function of the choroid layer of the eye.
supplies blood / nutrients and oxygen to the retina; absorbs stray light to reduce reflection inside eye.
The choroid is a vascular layer providing metabolic support to the retina and contains pigment to absorb excess light and prevent internal scattering.
blood supply to retina / nutrients / oxygen
absorbs stray light / prevents internal reflection
either function for 1 mark
Describe how you would test for colour blindness in a clinical or school setting (brief outline).
Use Ishihara plates (colored dot patterns) and ask the person to identify numbers/patterns; compare responses to expected answers; monocular testing and controlled lighting recommended.
Ishihara or other standard plates reveal inability to perceive certain wavelengths; results compared to a key determine red-green deficiencies and severity.
use Ishihara plates / standardized colour vision test
ask subject to identify numbers/patterns on plates and record responses
compare answers with expected responses (and test each eye separately under standard lighting)
Interpretation: On a ray diagram, how would a diverging (concave) spectacle lens change the path of parallel rays compared with no lens? Sketch or describe the effect and state why this is used to correct myopia.
A diverging lens spreads parallel rays outward so they appear to come from a virtual focal point in front of the lens. This reduces the converging power entering the eye so the image moves back onto the retina in myopic eyes.
Concave lenses provide negative optical power; by diverging incoming rays they compensate for the eye's excess positive power so distant images focus on the retina rather than in front of it.
diverging lens spreads / diverges parallel rays
rays appear to come from a virtual focal point (in front of lens)
reduces overall convergence entering eye
so focus shifts back onto retina correcting myopia
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