$A$ crop plant which can grow well even in nitrogen-deficient soil is:

Leghaemoglobin helps in

Which bacteria live symbiotically on the root system of leguminous plants?

Which of the following is a symbiotic nitrogen fixer?

Symbiotic nitrogen-fixing bacterium is . . . . . . .

We find that $Rhizobium$ forms nodules on the roots of leguminous plants. Also,$Frankia$,another microbe,forms nitrogen-fixing nodules on the roots of the non-leguminous plant $Alnus$. Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.