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(D) The process of root nodule formation in legumes involves the following sequential steps:$1$. First,the bacteria colonize the root surface and caus

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$c, a, b, d$

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(D) The process of root nodule formation in legumes involves the following sequential steps:$1$. First,the bacteria colonize the root surface and cause the curling of root hairs $(c)$.$2$. This is followed by the formation of an infection thread that carries the bacteria into the cortex of the root $(a)$.$3$. The bacteria then reach the inner cortex and pericycle,triggering the division of cortical and pericyclic cells,which leads to nodule formation $(b)$.$4$. Finally,the nodule matures and leghaemoglobin is synthesized to act as an oxygen scavenger,creating an anaerobic environment for nitrogenase activity $(d)$.Therefore,the correct sequence is $c, a, b, d$.

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.

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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.