Asthma is a respiratory disease caused by

Chronic respiratory disorders like $.......$ are caused by pollen grains.

Match the column-$I$ and column-$II$:

Column-$I$	Column-$II$
$(I)$ Asthma	$(A)$ Cigarette Smoking
$(II)$ Emphysema	$(B)$ Wheezing
$(III)$ Occupational respiratory disorders	$(C)$ Fibrosis

If the thoracic wall but not the lungs in man is punctured,what will be the immediate effect?

What is the minimum concentration and partial pressure of $CO$ in the alveoli that is dangerous to humans?

$A$ - Smoking is associated with increased incidence of cancer of lung.
$R$ - It increases $CO$ content in blood and reduces the concentration of haem-bound oxygen.