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Give the Steps of Nodule Formation.

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Steps of Nodule Formation : 

Rhizobium in soil interacts with roots of leguminous plants.

                          ↓

Rhizobia multiply, colonise and get attached to epidermal & root hair cells.

                            ↓

Curling of root hair & invasion of bacteria into root hair. 

                            ↓

Produce infection thread & carry bacteria into root cortex.

                             ↓

Initiate nodule formation in the cortex.

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