Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D –
A | B | C | D | |
1. | Nitri- fication |
Ammoni- fication |
Animals | Plants |
2. | Denitri- fication |
Ammon- ification |
Plants | Animals |
3. | Nitri- fication |
Denitri- fication |
Animals | Plants |
4. | Denitri- fication |
Nitrif- ication |
Plants | Animals |
Which one of the following is not a nitrogen-fixing organism?
1. Anabaena
2. Nostoc
3. Azotobacter
4. Pseudomonas
The below reaction depicts
1. Reductive amination
2. Transamination
3. Action of enzyme nitrogenise
4. Formation of amide
Nitrogen-fixing nodules on the roots of non-leguminous plants like Alnus are produced by
1. Rhizobium
2. Beijernickia
3. Azotobacter
4. Frankia
Which of the following bacteria reduce nitrate in soil into nitrogen?
1. Nitrobacter
2. Thiobacillus
3. Nitrococcus
4. Nitrosomonas
Select the mismatch.
(1) Frankia Alnus
(2) Rhodospirillium Mycorrhiza
(3) Anabaena Nitrogen fixer
(4) Rhizobium Alfa-fa
The free-living, anaerobic nitrogen-fixer is
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter
An organism used as a biofertilizer for raising soyabean crop is
1. Azospirillum
2. Rhizobium
3. Nostoc
4. Azotobacter
A nitrogen fixing microbe associated with Azolla in rice fields is
1. Spirulina
2. Anabaena
3. Frankia
4. Tolypothrix
Which of the following is a symbiotic nitrogen fixer?
1. Glomus
2. Azotobacter
3. Frankia
4. Azolla