Match Column - I with Column - II. Column - I Column - II (a) Nitrococcus (i) Denitrification (b) Rhizobium (ii) Conversion of ammonia to nitrite (c) Thiobacillus (iii) Conversion of nitrite to nitrate (d) Nitrobacter (iv) Conversion of atmospheric nitrogen to ammonia
Choose the correct answer from options given below.
| Column - I | Column - II | ||
| (a) | Nitrococcus | (i) | Denitrification |
| (b) | Rhizobium | (ii) | Conversion of ammonia to nitrite |
| (c) | Thiobacillus | (iii) | Conversion of nitrite to nitrate |
| (d) | Nitrobacter | (iv) | Conversion of atmospheric nitrogen to ammonia |
- (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
- (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
- (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
- (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
The Correct Option is B
Solution and Explanation
Let associate each microorganism with its respective metabolic process.
- Nitrococcus is known for the conversion of ammonia to nitrite.
- Rhizobium is associated with the conversion of atmospheric nitrogen to ammonia.
- Thiobacillus is responsible for converting nitrite to nitrate.
- Nitrobacter is involved in the denitrification process.
(a) Nitrococcus (ii) Conversion of ammonia to nitrite
(b) Rhizobium (iv) Conversion of atmospheric nitrogen to ammonia
(c) Thiobacillus (i) Conversion of nitrite to nitrate
(d) Nitrobacter (iii) Denitrification
So, the correct option is (B): (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
Top Questions on Nutrition
- Arrange the major steps involved in implementation of a public nutrition programme in correct order.
A. Determine strategies for the programme; develop the action plan and implement it
B. Prioritize the issues or nutrition health problems, to identify those that the programme will address
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List-I (Standardization Logo) List-II (Description/Application) A. 
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II. Displayed on the pack for foods that are free from harmful ingredients, food additives, or harmful processing aids. C. 
III. 100% Organic (food is free of artificial preservatives, flavors, colors, pesticides, and chemical fertilizers). D. 
IV. Marked on vegetable oil, pulses, cereals, veggies, honey, fruits, and vegetables indicating their quality.
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Concepts Used:
Metabolism of Nitrogen
Nitrogen Cycle
The central part of nitrogen metabolism is the Nitrogen Cycle. A nitrogen molecule is made of two nitrogen atoms held together by a solid triple covalent bond (N ≡ N). There are three central pools of nitrogen – atmosphere, soil, and biomass.
Atmospheric Pool
The process of converting atmospheric nitrogen (N2) to ammonia (NH3) is called nitrogen fixation. Atmospheric nitrogen is rooted in three ways – biological, electrical, and industrial.
Soil Pool
The above processes rooted atmospheric nitrogen into the soil. This nitrogen is then taken up by plants and animals, accordingly.
Biomass Pool
When plants and animals die, the organic nitrogen within them has degraded to ammonia the process is ‘Ammonification‘ and it returns nitrogen back to the soil.