Short answerModerate1 mark
3(b)
State the main functions of the following:
Tears
Topic: Tears
Previous-year question practice database
Answer
Exam answer
Tears KEEP THE CORNEA MOIST and wash away dust and foreign particles, keeping the front of the eye clean and transparent. They also contain the enzyme LYSOZYME, which kills bacteria and protects the eye from infection.
Explanation
Give BOTH functions — the cleaning and moistening, and the antibacterial action. The second is the one candidates omit and the more interesting: tears are not merely salt water but contain an enzyme.
Naming LYSOZYME secures the mark and shows precise knowledge.
Tears are secreted by the LACRIMAL GLANDS and drain into the nose through the tear duct — which is why crying makes the nose run.
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