Exams › NEET › Biology

One of the free-living, anaerobic nitrogen-fixer is:

1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter

Correct answer: Rhodospirillum

Solution

Rhodospirillum is a free-living, anaerobic photosynthetic bacterium that can fix nitrogen. Azotobacter is free-living but aerobic, Rhizobium is symbiotic in root nodules, and Beijerinckia is free-living but not the classic anaerobic choice here.

Related NEET Biology questions

• The most important mineral for blood coagulation is
• Match the following concerning essential elements and their functions in plants: (a) Iron (i) Photolysis of water (b) Zinc (ii) Pollen germination (c) Boron (iii) Required for chlorophyll biosynthesis (d) Manganese (iv) IAA biosynthesis Select the correct option:
• In which of the following forms is iron absorbed by plants?
• In which of the following, all three are macronutrients?
• Minerals known to be required in large amounts for plant growth include:
• Which of the following elements is responsible for maintaining turgor in cells?

⚔️ Practice NEET Biology free + battle 1v1 →