Loading...
UPSC 2000: Which one of the following organisms can serve as a biofertilizer for rice crop?
(a)Blue-green algae
(b)Rhizobium sp
(c)Mycorrhizal fungi
(d)Azotobacter sp
Attempt This Question
Not attemptedCorrect Answer: (a) Blue-green algae
Blue-green algae (cyanobacteria such as Anabaena and Nostoc) fix atmospheric nitrogen in submerged paddy fields and are widely applied as bio-fertilizer for rice. Rhizobium requires legume roots, mycorrhiza mainly improve phosphorus uptake, and Azotobacter is aerobic and less effective in flooded soils. ([pmc.ncbi.nlm.nih.gov](https://pmc.ncbi.nlm.nih.gov/articles/PMC8724949/?utm_source=openai))
Related UPSC Questions
More from Biotechnology & Genetics
Frequently Asked Questions
What is the correct answer to this UPSC 2000 Science & Technology question?▼
The correct answer is option (a): Blue-green algae. 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 2000, GS Paper 1, as Question 115. 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.