List the merits of local defense systems.

Given below are the groups of certain substances of particular categories. Mention the category of each group and identify the one wrong example in it giving a reason.

(a) Lysol, benzoic acid, DDT, mercurochrome.

(b) Formalin, iodine, Lysol, phenol.

(c) BCG, DTP, ATP.

(d) Tears, skin, nasal secretion, HCl (in the stomach).

List any four ways in which antibiotics are being used.

Suppose a person develops the disease diphtheria.

Comment upon the principle of the treatment he should receive.

What would first aid steps you take in the following cases of the accident?

(a) Bleeding from a cut in the skin.

(b) A fractured arm.

(c) Stoppage of breathing due to electrical shock.