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UPSC 2010: Which feature of some species of blue-green algae helps promote them as bio-fertilizers ?
(a)They convert atmospheric methane into ammonia which the crop plants can absorb readily.
(b)They induce the crop plants to produce the enzymes which help convert atmospheric nitrogen to nitrates.
(c)They have the mechanism to convert atmospheric nitrogen into a form that the crop plants can absorb readily.
(d)They induce the roots of the crop plants to absorb the soil nitrates in larger quantities.
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Not attemptedCorrect Answer: (c) They have the mechanism to convert atmospheric nitrogen into a form that the crop plants can absorb readily.
Certain blue-green algae (cyanobacteria such as Anabaena and Nostoc) possess heterocysts that fix atmospheric N₂ into ammonia, supplying usable nitrogen to crops like rice. They do not act on methane, induce plant enzymes, or merely enhance nitrate uptake; direct biological nitrogen fixation is the key feature.
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Frequently Asked Questions
What is the correct answer to this UPSC 2010 Science & Technology question?▼
The correct answer is option (c): They have the mechanism to convert atmospheric nitrogen into a form that the crop plants can absorb readily.. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biotechnology & Genetics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2010, GS Paper 1, as Question 58. It falls under Science & Technology > Biotechnology & Genetics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Biotechnology & Genetics?▼
UPSC has asked 54 questions from Biotechnology & Genetics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.