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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
Name the aquatic fern commonly used in paddy fields as a biofertilizer.
Define estuary.
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 |
identify the plants with which Anabaena, is associated.
Identify the CORRECT statement regarding Ectomycorrhizae.
Which of the following is one of the basic elements considered in green revolution?
Mycorrhiza is a______ which forms a symbiotic association with the underground parts like rhizomes and root of higher plants.
By application of ____________ yield of paddy field can be increased.
In plant breeding, biofortification is a method ____________.
Which of the following symbiotic microorganisms is nitrogen-fixing?
Which one of the following is NOT a nitrogen-fixing organism?
Glomus is a ______.
Why are blue green algae not popular as biofertilisers?
Farmers are often suggested to use the following organism in their crop land so as to improve the soil fertility. Explain.
Rhizobium
Which one of the following statement is correctly matched?
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.
Which of the following is NOT a primary benefit of using biofertilizers in agriculture?
What is the structural feature of mycorrhiza that enables enhanced mineral absorption?
What is the Greek etymological origin of the term 'mycorrhiza'?
