After infection of germs immunity acquired is
Active immunity
Passive immunity
Natural immunity
Both $(a)$ and $(b)$
Read the following sentences and choose correct sentences
$1.$ Dysentery, plague, diphtheria are caused by bacteria
$2.$ Salmonella typhi directly affect the respiratory system
$3.$ Amoebiasis and Ascariasis are caused by contaminated water
$4.$ Internal bleeding, anemia muscular pain are symptoms of elephantiasis
Which of the following is an $STD$
The disease filariasis is transmitted by
Secondary metabolites such as nicotine, strychnine and caffelne are produced by plants for their :
Kwashiorkar disease develops due to