Question

Some bacteria live symbiotically inside root nodules of higher plants. The basic activity of these bacteria is associated with

• A. carbon cycle
• B. nitrogen cycle
• C. water cycle
• D. oxygen cycle

Answer 1

Answer: (B)

nitrogen cycle

Legumes plants have root nodules that provide a shelter for symbiotic nitrogen-fixing bacteria called Rhizobia. They convert nitrogen gas from the atmosphere into ammonia, which is then used in the formation of amino acids and nucleotides.

So, the correct answer is ' nitrogen cycle'