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

Options

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

Answer

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 that is involved in fertilization.

2. **Locate the Embryo Sac**: Surrounding the egg cell is the **embryo sac**. The embryo sac is the structure that contains the egg and is equivalent to the female gametophyte.

3. **Recognize the Nucellus**: The next layer outside the embryo sac is the **nucellus**. The nucellus serves as the nutritive tissue for the developing embryo sac.

4. **Identify the Integuments**: The outermost layers of the ovule are the **integuments**. There are two integuments: the outer integument and the inner integument. These layers protect the ovule.

5. **Sequence of Parts**: Therefore, starting from the innermost part, the correct sequence of parts in an ovule is:
- Egg cell
- Embryo sac
- Nucellus
- Outer integument
- Inner integument

### Final Answer:
The correct sequence of parts in an ovule, starting from the innermost part, is:
**Egg cell → Embryo sac → Nucellus → Inner integument → Outer integument**