Which layer of the anther wall is the not derived from archesporium ?

Options

A. epidermis
B. endothecium
C. middle layer
D. tapetum

Answer

To solve the question "Which layer of the anther wall is not derived from archesporium?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Anther Structure**: The anther is part of the stamen in flowering plants and consists of several layers. It is important to identify these layers and their origins.

2. **Identifying the Layers of the Anther**: The anther wall consists of four main layers:
- Epidermis
- Endothelium
- Middle layer
- Tapetum

3. **Origin of the Layers**:
- The **Archesporium** is a layer of cells that gives rise to the sporogenous tissue and the outer parietal layers of the anther.
- The outer parietal layer differentiates into the endothelium, middle layer, and tapetum.

4. **Analyzing Each Layer**:
- **Epidermis**: This is the outermost layer and is not derived from the archesporium. It serves as a protective layer.
- **Endothelium**: This layer is derived from the archesporium.
- **Middle Layer**: This layer is also derived from the archesporium.
- **Tapetum**: This inner layer is derived from the archesporium and is responsible for nourishing the developing pollen grains.

5. **Conclusion**: Since the epidermis is the only layer that does not originate from the archesporium, we conclude that the correct answer to the question is the **Epidermis**.

### Final Answer:
The layer of the anther wall that is not derived from archesporium is the **Epidermis**.

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