Identify the following process from the diagram.

$Frankia$ is free-living in soil,but as symbionts,can fix atmospheric nitrogen.

Root nodules contain

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation?

Red pigment $(Leghaemoglobin)$ having affinity for oxygen is present in the roots of

Arrange the stages of root nodule formation in the correct sequence:
$I-$ Infection thread is produced.
$II-$ Bacteria are carried to the cortex of the root.
$III-$ Bacteria attach to the root hair.
$IV-$ Bacteria are released from the thread into the cells.
$V-$ Differentiation into nitrogen-fixing cells occurs.