Which organism is primarily responsible for nitrogen fixation in the soil?

Practice Questions

Q1
Which organism is primarily responsible for nitrogen fixation in the soil?
  1. Rhizobium bacteria
  2. Mycorrhizal fungi
  3. Cyanobacteria
  4. Actinomycetes

Questions & Step-by-Step Solutions

Which organism is primarily responsible for nitrogen fixation in the soil?
  • Step 1: Understand what nitrogen fixation is. It is the process of converting nitrogen gas from the atmosphere into a form that plants can use.
  • Step 2: Learn about Rhizobium bacteria. These are tiny organisms that live in the soil.
  • Step 3: Know that Rhizobium bacteria form a special relationship with leguminous plants, like beans and peas.
  • Step 4: Recognize that this relationship helps the plants get nitrogen from the soil, which is essential for their growth.
  • Step 5: Conclude that Rhizobium bacteria are primarily responsible for nitrogen fixation in the soil.
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