Rhizobium fix nitrogen in root nodules of legumes, while Azotobacter is a free-living nitrogen-fixing bacterium. Anabaena and Nostoc are not mobilisers of phosphates. Anabaena is a filamentous cyanobacteria, involved in nitrogen fixation. Extensive use of chemical fertilizers may lead to eutrophication of nearby waterbodies. Related Theory Eutrophication or more precisely hypertrophication, refers to enrichment of a water body with nutrients, usually with an excess amount of nutrients. This process induces growth of plants and algae and, due to the biomass load, may result in oxygen depletion of the water body. For example, algal bloom.
Which one of the following statements is correct?
NEET UG 2007 — Botany Biological Classification
2007mcqmedium
Which one of the following statements is correct?
Official previous-year question
Held on 30 Apr 2007 · Verified 9 Jul 2026.
Options
- A
Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
- B
Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil
- C
At present it is not possible to grow maize without chemical fertilizers
- D
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies.
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