1. | Ferric | 2. | Ferrous |
3. | Free element | 4. | Both ferric and ferrous |
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by?
1. Leghaemoglobin
2. Xanthophylls
3. Carotene
4. Cytochrome
Manganese is required in:
1. nucleic acid synthesis
2. plant cell wall formation
3. photolysis of water during photosynthesis
4. chlorophyll synthesis
1. | Bradyrhizobium | 2. | Clostridium |
3. | Frankia | 4. | Azorhizobium |
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
1. Casuarina equisetifolia
2. Crotolaria juncea
3. Cycas revoluta
4. Cicer arietinum
Which of the following is a non-symbiotic nitrogen fixer organism?
1. VAM
2. Azotobacter
3. Anabaena
4. Rhizobium
Which of the following is responsible for biological nitrogen fixation?
1. Nif gene
2. Nitrogenase
3. Both 1. and 2.
4. RNA synthetase