Advertisements
Advertisements
Question
Which one of the following is not a nitrogen-fixing organism?
Options
Anabaena
Nostoc
Azotobacter
Pseudomonas
Rhizobitim
Advertisements
Solution
Pseudomonas
Explanation:
- Pseudomonas is a common soil bacterium but does not fix atmospheric nitrogen.
- Nostoc, Anabaena, and Rhizobium are nitrogen-fixing organisms that convert atmospheric nitrogen (N2) into usable forms for plants.
Hence, Pseudomonas is not a nitrogen-fixing organism.
APPEARS IN
RELATED QUESTIONS
Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.
What are 'biofertilizers'? Explain them with suitable examples.
Give the meaning of the Nif gene.
How does the application of cyanobacteria help improve agricultural output?
Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.
- Recommend two microbes that can enrich the soil with nitrogen.
- Why do leguminous crops not require such enrichment of the soil?
Define biofertilizers. Give two types of fungal biofertilizers
Explain the interrelationship between organic farming and biofertilizers, with the help of any three suitable examples.
Identify free-living bacterial bio-fertilizer.
How does the activity of each one of the following help in organic farming?
Cyanobacteria
State any three benefits of mycorrhiza.
Match the column A with B and rewrite correct pairs.
| A | B | |
| i. | Symbiotic N2 fixing bacteria | VAM |
| ii. | Free-living N2 fixing bacteria | Rhizobium |
| iii. | Phosphate solubilizer | Nostoc |
| iv. | Endomycorrhizae | Microccocus |
______ are nitrogen fixing micro-organisms.
Identify the CORRECT statement regarding Ectomycorrhizae.
Which of the following is a free-floating aquatic fern?
Identify the CORRECT statement regarding Mycorrhiza.
Mycorrhiza is a______ which forms a symbiotic association with the underground parts like rhizomes and root of higher plants.
Anabaena forms symbiotic relationship coralloid roots of ______.
Mycorrhiza forms symbiotic association with ____________ of higher plants.
VAM is a type of ______
Which one of the following is not a biofertilizer?
Some blue-green algae are used as bio fertilisers of their ______.
Glomus is a ______.
- Give an example of a genus of fungi that forms mycorhizal association with plants.
- How does the plant derive benefits from this association?
Aspergillus niger is used to manufacture
Which of the following bacteria do not solubilize the insoluble rock phosphate?
