3.1 Identify part F - NSC Life Sciences - Question 3 - 2021 - Paper 1
Question 3
3.1 Identify part F.
3.1.2 State ONE function of part B.
3.1.3 Explain why the light rays must focus on part D rather than on part E.
3.1.4 Name the type of lens ... show full transcript
Worked Solution & Example Answer:3.1 Identify part F - 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 (cones and rods) that are responsible for detecting light. If light rays fall on part E, there are no photoreceptors there, leading to a lack of image formation.
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 type of lens used 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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Concave lenses help to diverge the light rays before they enter the eye, allowing them to focus correctly on the retina.
Step 6
Explain ONE way in which part C is structurally suited for accommodation
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Part C is elastic and can change its shape to focus light rays on the retina.
Step 7
Name the TWO muscles found in part G
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Circular (sphincter) muscles and radial (dilator) muscles.
Step 8
Name and describe the visual defect that occurs when part A is uneven
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Answer
This visual defect is astigmatism, which occurs when the cornea has an uneven shape, causing distorted or blurred vision.
