Home › NEET UG › Biology › Breathing and Exchange of Gases › A stone-crusher works for years in dust and deve…
A 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: NCERT Class 11 Biology, Chapter 17, Breathing and Exchange of Gases._
Related questions
Wheezing from inflamed bronchi and bronchioles is:The enzyme in red cells that speeds up carbon dioxide and water turning into bicarbonate iEvery 100 mL of oxygenated blood delivers about ___ of oxygen to the tissues.Oxygen binds haemoglobin in the lungs and leaves it at the:Haemoglobin is red because it contains:About 97 percent of oxygen in blood is carried by:Gases cross from alveoli to blood mainly by:After a normal breath you force in extra air. That extra amount is the: