Consider the following steps involved in nodule formation in the root of a legume.
(i). Bacteria release chemicals and enzymes.
(ii). Bacteria stop dividing and form bacteroides.
(iii). Roots secrete chemical atractants.
(iv). Formation of infection thread.
(v). Formation of nodules.
(v). Formation of nodulues.
(vi). Division of infected cortical cells.
(vii) Curlinig of root hair and degradation of their cell wall.
(viii). Infection thread grows along with multiplication of bacteria.
Arrange the steps in the right sequence and mark the correct option

Options

A. (iii).(i),(vii),(iv),(viii),(vi),(v),(ii)
B. (iii),(iv),(viii),(i),(vi),(vii),(ii),(v)
C. (i),(iv),(iii),(vi),(v),(vii),(viii),(ii)
D. (i),(iii),(vi),(iv),(viii),(ii),(v),(vii)

Explanation

To solve the question regarding the sequence of steps involved in nodule formation in the roots of legumes, we need to arrange the provided steps in the correct order. Here’s the step-by-step solution:

### Step-by-Step Solution:

1. **Roots secrete chemical attractants (Step iii)**: The process begins when the roots of the legume plant secrete chemical attractants to attract nitrogen-fixing bacteria (rhizobia) from the soil.

2. **Bacteria release chemicals and enzymes (Step i)**: Once the bacteria are attracted to the roots, they release specific chemicals and enzymes that facilitate the next steps in the process.

3. **Curling of root hair and degradation of their cell wall (Step vii)**: The enzymes released by the bacteria cause the root hairs to curl and degrade their cell walls, allowing the bacteria to enter.

4. **Formation of infection thread (Step iv)**: Following the curling of the root hairs, an infection thread is formed. This thread allows the bacteria to penetrate deeper into the root tissue.

5. **Infection thread grows along with multiplication of bacteria (Step viii)**: The infection thread continues to grow, and the bacteria multiply within this thread as they move into the root cells.

6. **Division of infected cortical cells (Step vi)**: As the bacteria invade the root cells, the infected cortical cells begin to divide, leading to the formation of nodules.

7. **Formation of nodules (Step v)**: Finally, the division of these cells results in the formation of nodules, which house the nitrogen-fixing bacteria.

### Correct Sequence:
The correct order of steps is:
- (iii) Roots secrete chemical attractants
- (i) Bacteria release chemicals and enzymes
- (vii) Curling of root hair and degradation of their cell wall
- (iv) Formation of infection thread
- (viii) Infection thread grows along with multiplication of bacteria
- (vi) Division of infected cortical cells
- (v) Formation of nodules

### Final Answer:
The correct option is **Option A** (if this corresponds to the sequence we derived).