Question

The organisms participating most actively in nitrogen cycle in nature are

• A. Bacteria
• B. Legumes
• C. Parasitic algae
• D. Fungi

Answer 1

Answer: (A)

Bacteria

Bacteria are the component of biological nitrogen fixation which included free living or non-symbiotic soil bacteria. It may be aerobic bacteria or blue-green algae.

The finger-like projections on roots of legumes, termed as root nodules, carries Rhizobium bacteria which in turn are responsible for nitrogen fixation; legumes depend on of bacteria for nitrogen fixation.

None of the parasitic algae or fungal species can fix nitrogen.

Thus, the correct answer is option A.