The diagram below represents a type of visual defect - NSC Life Sciences - Question 3 - 2021 - Paper 1
Question 3
The diagram below represents a type of visual defect.
3.1.1 Identify part F.
3.1.2 State ONE function of part B.
3.1.3 Explain why the light rays must focus on pa... show full transcript
Worked Solution & Example Answer:The diagram below represents a type of visual defect - NSC Life Sciences - Question 3 - 2021 - Paper 1
Step 1
Identify part F
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Answer
Part F is the sclera.
Step 2
State ONE function of part B
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Answer
Part B supplies the cells of the eye with oxygen and nutrients.
Step 3
Explain why the light rays must focus on part D rather than on part E
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Answer
Part D contains photoreceptors or cones, which are necessary for clear vision. Part E lacks photoreceptors, hence images formed there will not be interpretable.
Step 4
Name the type of lens that is used to correct the visual defect shown in the diagram
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Answer
The lens used to correct the visual defect is a concave lens.
Step 5
Describe how the type of lens named in QUESTION 3.1.4 corrects the visual defect
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Answer
Concave lenses help diverge the light rays before they enter the eye, effectively focusing them on the retina for clearer images.
Step 6
Explain ONE way in which part C is structurally suited for accommodation
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Part C is elastic, allowing it to change shape to help focus light rays on the retina.
Step 7
Name the TWO muscles found in part G
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The muscles found in part G are the circular and dilator muscles.
Step 8
Name and describe the visual defect that occurs when part A is uneven
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Answer
The visual defect that occurs when part A is uneven is astigmatism, which leads to blurred or distorted vision due to uneven curvature of the cornea.
