Question

Which among the following fixes atmospheric nitrogen into the soil?

• A. Chlamydomonas reinhardtii
  
• B. Spirogyra
  
• C. Rhizobium leguminosarum
  
• D. Lactobacillus acidophilus

Answer 1

Answer: (C)

Rhizobium leguminosarum

Rhizobium leguminosarum is a bacterium that lives in a mutualistic symbiotic relationship with legumes and has the ability to fix free nitrogen from the air. It attaches to the roots of the leguminous plant and produces nodules. These nodules fix atmospheric nitrogen and convert it into ammonia that can be used by the plant for its growth and development.

Thus, the correct answer is option C.