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O-LevelBiologyCell Biology5090/11 · Oct/Nov 2025 · Q41 Mark

Contact lenses are placed on the surface of the eye to correct problems with vision. One type of contact lens is partially permeable and is normally stored in a sterile sodium chloride solution. The sodium chloride solution has the same concentration as the fluid that covers the surface of the eye. A person makes a mistake and stores their contact lenses in distilled water rather than sodium chloride solution. They then place a contact lens on the surface of their eye. Which pair of statements describe what then happens? 1 Water from the eye fluid enters the contact lens by osmosis. 2 Water leaves the contact lens and enters the eye fluid by osmosis. 3 The contact lens shrinks. 4 The contact lens swells.

A1 and 3
B1 and 4
C2 and 3
D2 and 4

✓ Correct answer

C: 2 and 3

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About this question

Topic
Cell Biology, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source
O-Level Biology, Oct/Nov 2025 Paper 1 Variant 1, question 4.

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