A single replacementreaction occurs when two different cations switch places to combine with the same anion. One element forms a compound while another element is released from the compound. In a singlereplacementreaction, or single displacement reaction, a single<span> uncombined element replaces another in a compound.
The roots of most of these plants have nitrogen-fixing bacteria known as rhizobium. It helps to change nitrogen which is present in the air into the nitrates which are plants, and that is need to synthesize proteins.
Rhizobium bacteria occupy the root hairs which are present on the plants, they help the plant to grow and keep up with other plants. When the one plant dies, the fixed nitrogen which is present in it will release, and making it available for other plants, and this process helps to fertilize the soil in the environment.