Question:
Which of the following is/are the example of nitrifying bacteria?
Which of the following is/are the example of nitrifying bacteria?
Show Hint
Nitrifying bacteria convert ammonia $\rightarrow$ nitrite $\rightarrow$ nitrate in soil nitrogen cycle.
Updated On: Jul 2, 2026
- Nitrosomonas
- Nitrobacter
- Nitrospira
- Nitrosomonas, Nitrobacter, Nitrospira
Show Solution
Verified By Collegedunia
The Correct Option is D
Approach Solution - 1
All three — Nitrosomonas (ammonia to nitrite), Nitrobacter (nitrite to nitrate), and Nitrospira (complete nitrification) — are involved in the nitrification process in soil.
Was this answer helpful?
0
0
Show Solution
Verified By Collegedunia
Approach Solution -2
Alternate approach — Two-step nitrification pathway:
Nitrification occurs in two sequential microbial steps. In the first step, ammonia-oxidising bacteria convert ammonia to nitrite, and Nitrosomonas performs this step. In the second step, nitrite-oxidising bacteria convert nitrite to nitrate, and both Nitrobacter and Nitrospira carry out this conversion, with Nitrospira now known to dominate in many soils. Since the question asks which organisms are examples of nitrifying bacteria in general, not restricted to one step, any organism participating in either stage qualifies.
As Nitrosomonas, Nitrobacter, and Nitrospira are each responsible for a stage of the ammonia-to-nitrate pathway, all three are correctly classified as nitrifying bacteria, confirming the option listing all three.
Nitrification occurs in two sequential microbial steps. In the first step, ammonia-oxidising bacteria convert ammonia to nitrite, and Nitrosomonas performs this step. In the second step, nitrite-oxidising bacteria convert nitrite to nitrate, and both Nitrobacter and Nitrospira carry out this conversion, with Nitrospira now known to dominate in many soils. Since the question asks which organisms are examples of nitrifying bacteria in general, not restricted to one step, any organism participating in either stage qualifies.
As Nitrosomonas, Nitrobacter, and Nitrospira are each responsible for a stage of the ammonia-to-nitrate pathway, all three are correctly classified as nitrifying bacteria, confirming the option listing all three.
Was this answer helpful?
0
0
Top ICAR AIEEA Soil Science Questions
- Given below are two statements:
Statement (I): The process in which the ammonia is converted into nitrites and then further into nitrates is called denitrification.
Statement (II): Nitrate is usually the predominant form of available nitrogen that is absorbed.
In light of the above statements, choose the most appropriate answer from the options given below. - Cauliflower is an indicator plant for the deficiency of .
- Coal is rock of .
- What is the optimum range of soil moisture for effective ploughing?
- Type of soil water available for normal crop growth
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions