Question

Which is reaponsible for symbiotic nitrogen fixation?

Answer 1

Explanation:

The legume–Rhizobium symbiosis opens the unlimited access to atmospheric nitrogen as a source of nitrogen for the host plant. Symbiotic N2 fixation is considered to be tuned to the plant's demand for symbiotically fixed nitrogen.

Answer 2

Answer:

They contain symbiotic bacteria called rhizobia within nodules in their root systems, producing nitrogen compounds that help the plant to grow and compete with other plants. When the plant dies, the fixed nitrogen is released, making it available to other plants; this helps to fertilize the soil.