Match the items in Group $-I$ with those in Group $-I I$ and choose the right combination.
Group - I                               Group - II 

P. Activated sludge process  1. Nitrifiers and denitrifiers
Q. Rising of sludge               2. Autotrophic bacteria
R. Conventional nitrification   3. Heterotrophic bacteria
S. Biological nitrogen removal 4. Denitrifiers
(A) $\mathrm{P}-3, \mathrm{Q}-4, \mathrm{R}-2, \mathrm{~S}-1$
(B) $\mathrm{P}-2, \mathrm{Q}-3, \mathrm{R}-4, \mathrm{~S}-1$
(C) $\mathrm{P}-3, \mathrm{Q}-2, \mathrm{R}-4, \mathrm{~S}-1$
(D) $\mathrm{P}-1, \mathrm{Q}-4, \mathrm{R}-2, \mathrm{~S}-3$

Question ID - 156300 | SaraNextGen Top Answer

Match the items in Group $-I$ with those in Group $-I I$ and choose the right combination.
Group - I                               Group - II 

P. Activated sludge process  1. Nitrifiers and denitrifiers
Q. Rising of sludge               2. Autotrophic bacteria
R. Conventional nitrification   3. Heterotrophic bacteria
S. Biological nitrogen removal 4. Denitrifiers
(A) $\mathrm{P}-3, \mathrm{Q}-4, \mathrm{R}-2, \mathrm{~S}-1$
(B) $\mathrm{P}-2, \mathrm{Q}-3, \mathrm{R}-4, \mathrm{~S}-1$
(C) $\mathrm{P}-3, \mathrm{Q}-2, \mathrm{R}-4, \mathrm{~S}-1$
(D) $\mathrm{P}-1, \mathrm{Q}-4, \mathrm{R}-2, \mathrm{~S}-3$