Arrange the principle stages in nodule formation in a leguminous plant in a correct sequence.

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Curling of root-hairs $\to$ Rhizobia multiply and colonise the surroundings of roots $\to$ Infection thread is produced $\to$ Bacteria is carried into the cortex of the root $\to$ Nodule formation initiate in the cortex of the root

Rhizobia multiply and colonise the surroundings of roots $\to$ Curling of root-hairs $\to$ Infection thread is produced $\to$ Nodule formation initiate in the cortex of the root $\to$ Bacteria is carried into the cortex of the root

Rhizobia multiply and colonise the surroundings of roots $\to$ Infection thread is produced $\to$ Curling of root-hairs $\to$ Bacteria is carried into the cortex of the root $\to$ Nodule formation initiate in the cortex of the root

Rhizobia multiply and colonise the surroundings of roots $\to$ Curling of root-hairs $\to$ Infection thread is produced $\to$ Bacteria is carried into the cortex of the root $\to$ Nodule formation initiate in the cortex of the root

answer is D.

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Detailed Solution

Principal stages in the nodule formation are:
Rhizobia multiply and colonise the surroundings of roots $\to$ Curling of root-hairs $\to$ Infection thread is produced $\to$ Bacteria is carried into the cortex of the root $\to$ Nodule formation initiate in the cortex of the root

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