Which of the following statements are correct regarding the development of embryo sac ?
(i) The type of nuclear division is free , in which there is no formation of the cell wall .
(ii) Out of the eight nuclei , six are surrounded by a cell wall .
(iii) Central cell situated below the egg apparatus.

Options

A. i and ii only
B. ii and iii only
C. iii only
D. All are correct

Answer

To solve the question regarding the development of the embryo sac, let's analyze each statement one by one.

### Step 1: Analyze Statement (i)
**Statement (i)**: The type of nuclear division is free, in which there is no formation of the cell wall.

- In the development of the embryo sac (which occurs during the formation of the female gametophyte in angiosperms), the initial divisions are indeed free nuclear divisions. This means that the nuclei divide without the formation of cell walls between them. Therefore, this statement is **correct**.

### Step 2: Analyze Statement (ii)
**Statement (ii)**: Out of the eight nuclei, six are surrounded by a cell wall.

- In the mature embryo sac, there are a total of eight nuclei. However, only three of these nuclei (the egg cell and the two synergids) are not surrounded by a cell wall initially. The remaining five nuclei (the central cell and the antipodal cells) are surrounded by cell walls. Thus, this statement is **incorrect**.

### Step 3: Analyze Statement (iii)
**Statement (iii)**: Central cell situated below the egg apparatus.

- The central cell is indeed located below the egg apparatus in the embryo sac. The egg apparatus consists of the egg cell and the two synergids, which are positioned at the micropylar end, while the central cell is located at the opposite end. Therefore, this statement is **correct**.

### Conclusion
Based on the analysis:
- Statement (i) is correct.
- Statement (ii) is incorrect.
- Statement (iii) is correct.

Thus, the correct answer regarding the statements about the development of the embryo sac is that statements (i) and (iii) are correct.

### Final Answer
The correct option is: **1st and 3rd only**.