Question

13. Explain the steps involved in the formation of root module​

Answer 1

Explanation:

1) The Rhizobium bacteria divide and form colonies. These get attached to the root hairs and epidermal cells

. 2) The root hairs get curled and are invaded by the bacteria.

3) This invasion is followed by the formation of an infection thread that carries the bacteria into the cortex of the root.

Answer 2

Here is your answer dear⛄

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$\rm\underline\purple{of \: root \: nodules }$ :-

1. The root of host Legumes release sugars and amino acids.
2. These sugars attract Rhizobia.
3. They multiply, colonise and get attracted to the epidermis of root hair cells.
4. The root hairs curl and bacteria spread into the cortex of the root.
5. Then an infection thread is produced.
6. It carries the bacteria into the cortex.
7. The bacteria initiate nodule formation in the cortex of the root.
8. Then the bacteria present in the cortical cells, stimulate the host cells to divide.
9. This leads to the differentiation of specialised nitrogen fixing cells, which form root nodule.
10. The nodule thus formed establishes a direct vascular connection with the host, for exchange of nutrients .

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