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

If all $Nitrogenase$ enzymes are inactivated by radiation,which of the following processes will not occur?

Symbiotic nitrogen fixation in non-leguminous plants is carried out by

Mark the correct sequence of steps for the development of root nodules in legumes:
$a.$ Formation of infection thread.
$b.$ Division of cortical and pericyclic cells.
$c.$ Curling of root hairs.
$d.$ Leghaemoglobin synthesis.

Nodules with nitrogen-fixing bacteria are present in

Leghemoglobin is found in which one of the following organisms?