Which is not part of anther wall

Options

A. Epidermis
B. Middle layers
C. Endothecium
D. Nucelus .

Answer

To determine which option is not a part of the anther wall, we need to first understand the structure of the anther and its components.

### Step-by-Step Solution:

1. **Understand the Structure of Anther**:
- The anther is a part of the stamen, which is the male reproductive organ of a flower. It consists of two main parts: the anther itself and the filament.

2. **Identify the Layers of the Anther Wall**:
- The anther wall is composed of four distinct layers:
- **Epidermis**: The outermost layer that provides protection.
- **Endothecium**: The layer beneath the epidermis, also providing protection.
- **Middle Layers**: A layer that lies between the endothecium and the tapetum, which also serves a protective function.
- **Tapetum**: The innermost layer that provides nourishment to the developing pollen grains.

3. **Analyze the Options**:
- Now, let's evaluate the provided options:
- **Option A: Epidermis** - This is part of the anther wall.
- **Option B: Middle Layers** - This is also part of the anther wall.
- **Option C: Endothecium** - This is another layer of the anther wall.
- **Option D: Nucellus** - This is not part of the anther wall; it is found in the ovule.

4. **Conclusion**:
- The correct answer to the question "Which is not part of anther wall?" is **Option D: Nucellus**.