Starting from the innermost part, the correct sequence of parts in an ovule are

Options

A. egg, nucellus, embryos sac, integument
B. egg, embryo, sac, nucellus, integument
C. embryo, sac, nucellus, integument, egg
D. egg, integument, embryo sac, nucellus

Explanation

To determine the correct sequence of parts in an ovule starting from the innermost part, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Innermost Part**: The innermost part of the ovule is the **egg cell**. This is the female gamete involved in fertilization.

2. **Next Layer - Embryo Sac**: Surrounding the egg cell is the **embryo sac**. The embryo sac contains the egg cell and other structures necessary for fertilization and development.

3. **Presence of Polar Nuclei**: Within the embryo sac, there are two **polar nuclei**. These nuclei play a crucial role during fertilization, particularly in the formation of the endosperm.

4. **Nucleus of the Ovule**: After the polar nuclei, we have the **nucleus** of the ovule. This is the central part of the ovule that develops into the embryo sac.

5. **Integuments**: Finally, the outer layers are the **integuments**. These are protective layers surrounding the ovule and are derived from the surrounding tissue.

### Final Sequence:
Thus, starting from the innermost part, the correct sequence of parts in an ovule is:
- Egg
- Embryo sac
- Polar nuclei
- Nucleus
- Integuments