(A) $$ \to $$ (iv), (B) $$ \to $$ (i), (C) $$ \to $$ (ii), (D) $$ \to $$ (iii)

(A) $$ \to $$ (iii), (B) $$ \to $$ (iv), (C) $$ \to $$ (i), (D) $$ \to $$ (ii)

(A) $$ \to $$ (i), (B) $$ \to $$ (iii), (C) $$ \to $$ (ii), (D) $$ \to $$ (iv)

(A) $$ \to $$ (ii), (B) $$ \to $$ (i), (C) $$ \to $$ (iii), (D) $$ \to $$ (iv)

Trophozoites

Sporozoites

Male gametocytes

Female gametocytes

Active immunity is quick and gives full response.

When exposed to antigen (living or dead) antibodies are produced in the host’s body. It is called “Active immunity”.

Foetus receives some antibodies from mother, it is an example for passive immunity.

When ready-made antibodies are directly given, it is called “Passive immunity”

Effluents of primary treatment

Primary sludge

Floating debris

Activated sludge