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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.
What is a heterocyst?
Give the meaning of the Nif gene.
How does the application of the fungal genus, Glomus, to the agricultural farm increase the farm output?
How does the activity of each one of the following help in organic farming?
Cyanobacteria
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.
Which of the following is a free-floating aquatic fern?
Which of the following is one of the basic elements considered in green revolution?
Anabaena forms symbiotic relationship coralloid roots of ______.
Mycorrhiza forms symbiotic association with ____________ of higher plants.
Blue green algae are used as bio fertilizers because they ____________.
Which of the following symbiotic microorganisms is nitrogen-fixing?
Some blue-green algae are used as bio fertilisers of their ______.
Soil microorganisms mainly comprise:
Glomus is a ______.
Mycorrhiza does not help the host plant in ______.
Why are blue green algae not popular as biofertilisers?
Match the pairs:
| Column A | Column B | ||
| (i) | Compost making biofertilizer |
(a) | Azotobacter |
| (ii) | N2 fixing biofertilizer | (b) | Mycorrhiza |
| (iii) | Fungal biofertilizer | (c) | Agrobacterium |
| (iv) | Phosphate solubilizing biofertilizer |
(d) | Actinobocteria |
