Which of the following organisms do not play a role in the Nitrogen Cycle?

The Nitrogen Cycle is a natural process in which nitrogen is converted into various chemical forms that are usable by living organisms. Different microorganisms play a vital role in this process.

Rhizobium is a nitrogen-fixing bacteria found in the root nodules of leguminous plants. It converts atmospheric nitrogen into ammonia and helps in the Nitrogen Cycle.

Blue-green algae, also known as cyanobacteria, are capable of fixing nitrogen and converting it into a usable form for other organisms.

Denitrifying bacteria break down nitrates into nitrogen gas, which returns to the atmosphere and completes the Nitrogen Cycle.

Mycobacterium is a genus of bacteria that includes species responsible for causing diseases like tuberculosis and leprosy. They do not have any role in the Nitrogen Cycle.