Q. HOW DO THE NITROGEN FIXING BACTERIA ENTER THE ROOTS?

  • The nitrogen fixing bacteria such as Rhizobium, multiplied and colonised the surroundings of the roots and get attached to epidermal and root hair cells.
  • The root hairs then curled and allowed the bacteria to invade the root hair. An infection thread is produced carrying the bacteria into the cortex of the root where the nodule formation initiated by the bacteria.
  • The bacteria further released from the thread into the cells which leads to the differentiation of specialised nitrogen fixing cells. The nodule formed will help the bacteria to established a direct connection with the host for exchange of nutrients. This is how bacteria managed to enter into the roots.

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