1. Cellulose
2. Vitamin
3. Calcium
4. Protein
Calcium
1. free nitrogen gas
2. nitric acid
3. nitrates
4. nitrites
nitrates
1. amino acid oxidase
2. tryptophan synthetase
3. succinic acid dehydrogenase
4. PEPCO
tryptophan synthetase
1. Mo
2. S
3. B
4. Mg
S
1. NO3 into NH3
2. NH3 into NO2
3. NO2 into NO3
4. NO2 into NH3
NH3 into NO2
1. Mo
2. Fe
3. Zn
4. Cu
Mo
1. Roots of maize associated with Spirillum notatum
2. Roots of Digitaria in association with Spirillum notatum
3. Coralloid roots of Cycas is associated with Anabaena
4. All of the above
All of the above
1. TMV
2. Yeast
3. Nostoc
4. Denitrifying bacteria
Nostoc
1. Fe
2. Na
3. K
4. Zn
Na
1. help in NO2 fixation
2. do not help in NO2 fixation
3. increase soil fertility
4. All of the above
increase soil fertility