Write the function of tapetum in anther.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure of Anther**: The anther is a part of the stamen in flowering plants and consists of microsporangia, which are responsible for producing pollen grains.

2. **Layers of the Microsporangia**: The wall of the microsporangia has four layers:
- **Epidermis**: The outermost layer that provides protection.
- **Endothesium**: A layer that aids in the dehiscence (opening) of the anther to release pollen.
- **Middle Layers**: These layers are generally 1 to 3 cells thick and also contribute to protection.
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