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 Which of the following fall under the category of “biofertilizers”?
1. Azospirillum
2. Anabaena
3. Azotobacter
4. Blue green algae
Select the correct answer using the code given below:
  • a)
    1, 2 and 3 only
  • b)
    1, 2 and 4 only
  • c)
    2, 3 and 4 only
  • d)
    1, 2, 3 and 4
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Which of the following fall under the category of “biofertilizer...
Biofertilizers are the organisms that enrich the nutrient quality of the soil. The main sources of biofertilizers are bacteria, fungi and cyanobacteria. The nodules on the roots of the leguminous plants, formed by the symbiotic association of rhizobium. These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as nutrient. Other bacteria can fix atmospheric nitrogen, while free-living in the soil (e.g., Azospirillum and Azotobacter), thus enriching the nitrogen content of the soil. Fungi are also known to form symbiotic associations with the plants (mycorrhiza). Cyanobacteria are autotrophic microbes, widely distributed in the aquatic and terrestrial environments, many of which can fix atmospheric nitrogen, e.g., Anabaena, Nostoc, Oscillatoria, etc. In the paddy fields, cyanobacteria serve as an important biofertilizer. Blue green algae also add organic matter to the soil and increase its fertility.
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Which of the following fall under the category of “biofertilizers”?1. Azospirillum2. Anabaena3. Azotobacter4. Blue green algaeSelect the correct answer using the code given below:a)1, 2 and 3 onlyb)1, 2 and 4 onlyc)2, 3 and 4 onlyd)1, 2, 3 and 4Correct answer is option 'D'. Can you explain this answer?
Question Description
Which of the following fall under the category of “biofertilizers”?1. Azospirillum2. Anabaena3. Azotobacter4. Blue green algaeSelect the correct answer using the code given below:a)1, 2 and 3 onlyb)1, 2 and 4 onlyc)2, 3 and 4 onlyd)1, 2, 3 and 4Correct answer is option 'D'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Which of the following fall under the category of “biofertilizers”?1. Azospirillum2. Anabaena3. Azotobacter4. Blue green algaeSelect the correct answer using the code given below:a)1, 2 and 3 onlyb)1, 2 and 4 onlyc)2, 3 and 4 onlyd)1, 2, 3 and 4Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following fall under the category of “biofertilizers”?1. Azospirillum2. Anabaena3. Azotobacter4. Blue green algaeSelect the correct answer using the code given below:a)1, 2 and 3 onlyb)1, 2 and 4 onlyc)2, 3 and 4 onlyd)1, 2, 3 and 4Correct answer is option 'D'. Can you explain this answer?.
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