3.1 Identify part:
(a) A
(b) C
(c) D
3.1.2 Describe how the muscles in the iris enable a person to see in dim light - NSC Life Sciences - Question 3 - 2024 - Paper 1
Question 3
3.1 Identify part:
(a) A
(b) C
(c) D
3.1.2 Describe how the muscles in the iris enable a person to see in dim light.
3.1.3 Name the process that occurs in the eye ... show full transcript
Worked Solution & Example Answer:3.1 Identify part:
(a) A
(b) C
(c) D
3.1.2 Describe how the muscles in the iris enable a person to see in dim light - NSC Life Sciences - Question 3 - 2024 - Paper 1
Step 1
Identify part A:
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Answer
Part A is the Blind spot of the eye where no photoreceptors are present.
Step 2
Identify part B:
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Answer
Part B is the Lens, which helps focus light onto the retina.
Step 3
Identify part C:
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Answer
Part C is the Cornea, which provides most of the eye's optical power.
Step 4
Identify part D:
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Answer
Part D is the Sclera, the tough outer layer of the eyeball.
Step 5
Describe how the muscles in the iris enable a person to see in dim light:
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Answer
In dim light, the radial muscles contract and the circular muscles relax. This causes the pupil to dilate, allowing more light to enter the eye, enhancing visibility.
Step 6
Name the process that occurs in the eye when a person focuses on objects at different distances:
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Answer
The process is known as Accommodation, where the lens changes shape to focus on near or distant objects.
Step 7
Explain how the shape of part B enables a person to read a book:
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Answer
The lens becomes more convex when focusing on nearby objects. By changing its shape, it refracts light rays more strongly, allowing clear images of close objects, like a book, to form on the retina.
