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प्रश्न
Why are cyanobacteria considered useful in paddy fields?
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उत्तर
Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments many of which can fix atmospheric nitrogen e.g. Anabaena, Nostoc, Oscillatoria, etc. In paddy fields, cyanobacteria serve as an important biofertiliser. Blue-green algae also add organic matter to the soil and increase its fertility.
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संबंधित प्रश्न
Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.
How do biofertilisers enrich the fertility of the soil?
What are 'biofertilizers'? Explain them with suitable examples.
What is a heterocyst?
Give the meaning of the Nif gene.
Which one of the following is a free-living bacterial biofertilizer?
______ associated with plants like Azolla and Cycas can be used as a biofertilizers.
______ are nitrogen fixing micro-organisms.
identify the plants with which Anabaena, is associated.
Which of the following is a free-floating aquatic fern?
Mycorrhiza forms symbiotic association with ____________ of higher plants.
In plant breeding, biofortification is a method ____________.
Soil microorganisms mainly comprise:
Which one of the following is NOT a nitrogen-fixing organism?
Which one of the following statement is correctly matched?
Name the microorganisms involved in the production of Roquefort cheese, Camembert cheese and Swiss cheese.
Which of the following bacteria do not solubilize the insoluble rock phosphate?
How many statements are true about biofertilizers?
- They are nitrogen fixers.
- They are commercial preparation of live bacteria and fungi.
- Use of biofertilizers is expensive.
- There is only one type of biofertilizer.
- They are classified as inorganic.
