Q. No.| List - I | List - 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 |
| Options: | (A) | (B) | (C) | (D) |
| 1. | III | I | IV | II |
| 2. | IV | III | II | I |
| 3. | II | IV | I | III |
| 4. | I | II | III | IV |
1. Catalase
2. leg haemoglobin
3. Transaminase
4. Glutamate dehydrogenase
1. Rhizobium and Frankia
2. Azotobacter and Beijernickia
3. Anabaena and Rhodospirillum
4. Pseudomonas and Thiobacillus
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) | Nitrobactèr | (iv) | Conversion of atmospheric nitrogen to ammonia |
Choose the correct answer from the options given below:
| Options: | (a) | (b) | (c) | (d) |
| 1. | iii | i | iv | ii |
| 2. | iv | iii | ii | i |
| 3. | ii | iv | i | iii |
| 4. | i | ii | iii | iv |
Which of the following bacteria reduce nitrate in soil into nitrogen?
1. Nitrobacter
2. Thiobacillus
3. Nitrococcus
4. Nitrosomonas
Select the mismatch:
| Column I | Column II | |
| 1. | Rhodospirillum | Mycorrhiza |
| 2. | Anabaena | Nitrogen fixer |
| 3. | Rhizobium | Alfalfa |
| 4. | Frankia | Alnus |
1. convert free nitrogen to nitrogen compounds
2. convert proteins into ammonia
3. reduce nitrates to free nitrogen
4. oxidize ammonia to nitrates
The free-living, anaerobic nitrogen-fixer is:
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter
Study the cycle shown below and select the option which gives the correct words for all four blanks A, B, C, and D:
Options:
| A | B | C | D | |
| 1. | Denitrification | Ammonification | Plants | Animals |
| 2. | Nitrification | Denitrification | Animals | Plants |
| 3. | Denitrification | Nitrification | Plants | Animals |
| 4. | Nitrification | Ammonification | Animals | Plants |
Which of the following is a symbiotic nitrogen fixer?
1. Glomus
2. Azotobacter
3. Frankia
4. Azolla
© 2026 GoodEd Technologies Pvt. Ltd.