alleryA stone-crusher works for years in dust and develops lung fibrosis. Such workers should wear:
AWarm woollen gloves
BSteel safety boots
CDark sunglasses
DProtective masks
Answer & Solution
Correct answer: D. Protective masks
1. Dust overwhelms the body's defences.
2. Long exposure leads to fibrosis.
3. A protective mask keeps the dust out.
_Source: syllabus Biology, Chapter 17, Breathing and Exchange of Gases._
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