Main function of middle layer in microsporangium is

Options

A. Mechanical support
B. Protection
C. Storage of food
D. Dehiscence

Answer

### Step-by-Step Solution:

1. **Understanding Microsporangium**:
- A microsporangium is a part of the male reproductive structure in flowering plants. It is specifically involved in the production of pollen grains.

2. **Location of Microsporangium**:
- Microsporangia are found within the anther, which is a component of the stamen (the male part of a flower).

3. **Structure of Microsporangium**:
- Each microsporangium is bilobed, meaning it has two lobes. These lobes are connected by connective tissue.

4. **Layers of Microsporangium**:
- The microsporangium consists of four layers:
- **Epidermis** (outermost layer)
- **Endothecium**
- **Middle layers** (the focus of the question)
- **Tapetum** (innermost layer)

5. **Function of the Middle Layer**:
- The middle layer is situated between the endothecium and the tapetum. Its primary role is to provide mechanical support and protection to the developing pollen grains.

6. **Importance of Other Layers**:
- While the middle layer provides support, the tapetum plays a crucial role in nourishing the pollen grains, making it vital for their development.

7. **Conclusion**:
- Therefore, the main function of the middle layer in the microsporangium is to provide protection to the growing pollen grains.