Question

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Answer 1

This diagram shows the formation of nodes in the roots of leguminous plants.

Explanation:

The formation of nodes in the legumes is an example of the symbiotic relationship between the Rhizobium species and the leguminous plants. The Rhizobium species, fixed nitrogen in the roots.

1. The Rhizobium species infect the roots.

2. The bacterium releases certain hormones that cause a change of structure of the root hair and leads to their curling.

3. The bacterium enters the root hair. The bacterium then undergoes uncontrolled division and increase in number.

4. The infection then reaches the cortex cells.

5. The bacterial cells induce rapid cell division in the cortical cells.

6. This rapid cell division leads to the formation of nodules on the surface of the roots