Answer :
The cycle that depends on the bacteria in the nodules of plant roots is the nitrogen cycle.
1. In the nitrogen cycle, bacteria that reside in the nodules of certain plants, like legumes, play a crucial role in nitrogen fixation.
2. These bacteria, known as rhizobia, have a symbiotic relationship with the plant roots, where they convert atmospheric nitrogen (N2) into a form of nitrogen (NH3 or ammonium) that can be utilized by the plant for growth and development.
3. This process of nitrogen fixation by the bacteria in the nodules helps in increasing the nitrogen content in the soil, making it available for plant uptake.
4. As a result, the presence of these bacteria in the nodules of plant roots is essential for facilitating the conversion of atmospheric nitrogen into a usable form, thereby supporting plant growth and productivity.
In conclusion, the nitrogen cycle relies on the bacteria living in the nodules of plant roots to convert atmospheric nitrogen into a form that plants can absorb and utilize for their metabolic processes.
