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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 are 'biofertilizers'? Explain them with suitable examples.
Give the meaning of the Nif gene.
______ associated with plants like Azolla and Cycas can be used as a biofertilizers.
State any three benefits of Biofertilizers.
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 CORRECT statement regarding Mycorrhiza.
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.
Which of the following statements are CORRECT regarding Anabaena and Frankia?
Blue green algae are used as bio fertilizers because they ____________.
An organism used as a biofertiliser for raising soyabean crop prediction is:
Glomus is a ______.
Which one of the following is not a nitrogen-fixing organism?
Give two examples of biofertilizer.
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 |
Which one of the following statement is correctly matched?
- Give an example of a genus of fungi that forms mycorhizal association with plants.
- How does the plant derive benefits from this association?
How many of the following are the symbiotic nitrogen fixing micro-organisms?
Rhizobium, Anabaena, Frankia, Azotobacter, Nostoc, Clostridium, Beijerinckia, Klebsiella
