Below given reaction can be induced by
`2NH_(3)+3O_(2)to 2NO_(2)^(-)+2H^(+)+2H_(2)O`
(a) Nitrosomonas
(b) Nitrococcus
(c) Nitrobacter
(d) Pseudomonas
(e) Thiobacillus

Options

A. a and e only
B. a and b only
C. d and e only
D. only c

Answer

To solve the question regarding which bacteria can induce the given reaction, we will follow these steps:

### Step 1: Understand the Reaction
The reaction provided is:
\[ 2NH_3 + 3O_2 \rightarrow 2NO_2^- + 2H^+ + 2H_2O \]
This reaction involves the oxidation of ammonia (NH₃) to nitrite ions (NO₂⁻), which is a part of the nitrification process.

### Step 2: Identify the Process
This reaction is indicative of nitrification, which is a two-step process:
1. The first step involves the oxidation of ammonia to nitrite.
2. The second step involves the oxidation of nitrite to nitrate.

### Step 3: Identify the Bacteria Involved
- **Nitrosomonas**: This bacterium is responsible for the first step of nitrification, where ammonia is oxidized to nitrite.
- **Nitrococcus**: This bacterium can also oxidize ammonia to nitrite and is involved in the nitrification process.
- **Nitrobacter**: This bacterium is responsible for the second step of nitrification, where nitrite is oxidized to nitrate.
- **Pseudomonas** and **Thiobacillus**: These are denitrifying bacteria, which means they convert nitrates back to nitrogen gas, and are not involved in the oxidation of ammonia.

### Step 4: Determine the Correct Answer
Since the question asks for the bacteria responsible for the reaction that oxidizes ammonia to nitrite, the correct answers are:
- (a) Nitrosomonas
- (b) Nitrococcus

### Final Answer
The reaction can be induced by:
**(a) Nitrosomonas and (b) Nitrococcus.**

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