IX. A plant that can show root nodule formation
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Explanation:
Root nodules are found in plants belonging to the family Fabaceae or Leguminosae.
They include leguminous plants like beans, peas, peanuts etc.
It is formed due to the symbiotic association between the leguminous plant and the host-specific bacteria called the rhizobium.
The steps involved in root nodule formation are-
1) Rhizobium bacteria divides to form colonies which surround the root hairs and epidermal cells of the plant.
2) The root hair gets curled and get invaded by the bacteria.
3) After the invasion, it forms an infection thread that carries the bacteria into the cortex of the root.
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