Question
Give only the schematic representation of nodule formation in plants.
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Formation of nodule in plants is done by series of events.
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Rhizobium multiply and colonise the surrounding of Roots.
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(attached to the epidermal root hair cells)
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$\downarrow$
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The root hair curled up at the tip
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$\downarrow$
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Bacteria invade the root hair and enter it
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$\downarrow$
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Enzymes from the bacteria degrade the parts of root hair cell wall which produces a thread-like structure called infection thread
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$\downarrow$
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Bacteria invade infection thread and reach upto inner cortex of root
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$\downarrow$
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After reaching near the cortex it stimulates the initiation of formation of nodule
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$\downarrow$
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The division of cortex cells leads to the formation of mature nodule which makes direct vascular contact with host for nutrient exchange
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