Question

Math List-I (Organism) with List-II (Process) and select the correct answer using the codes given below the lists:

List-I (Organism)	List-II (Process)
A. Nitrosomonas	1. organisms that converts NH3 to NO2
B. Nitrobacter	2. microorganisms that are mainly used in an activated sludge process
C. Aerobic Heterotrophs	organisms that convert NO2 to NO3
D. Phototrophs	4. organism that use energy from sunlight to synthesize organic compounds for nutrition

1. A-1, B-2, C-4, D-3
2. A-3, B-1, C-2, D-4
3. A-4, B-3, C-2, D-1 
4. A-1, B-3, C-2, D-4
5.

Answer 1

Correct Answer - Option 4 : A-1, B-3, C-2, D-4

Explanation:

(i) Conventional Nitrification:

• Nitrification is an aerobic process performed by small groups of autotrophic bacteria and archaea.
• Two groups of autotrophic bacteria can be associated with the process of nitrification (Nitrosomonas and Nitrobacter).
• Nitrosomonas convert NH₃ to NO₂
• Nitrobacter convert NO₂ to NO₃

(ii) Aerobic Heterotrophs are mainly used in an activated sludge process. In the activated sludge process, in the presence of food mass and oxygen heterotrophic bacteria convert food mass into biomass.

(iii) Phototrophs use energy from sunlight to synthesize organic compounds for nutrition.