In the anther, stomium occurs

Options

A. At the tip
B. In groove of each anther lobe
C. At the base of anther
D. Transversely on the anther.

Answer

To solve the question "In the anther, stomium occurs," we need to analyze the structure of the anther and identify where the stomium is located.

### Step-by-Step Solution:

1. **Understanding the Structure of the Anther**:
- The anther is part of the stamen in flowering plants and is responsible for producing pollen grains. It consists of two lobes, each containing microsporangia.

2. **Identifying the Layers of the Anther**:
- Each microsporangium in the anther has four wall layers:
- **Epidermis**: The outermost layer.
- **Endothecium**: A layer of elongated cells beneath the epidermis.
- **Middle Layer**: A layer that lies below the endothecium.
- **Tapetum**: The innermost layer that nourishes the developing pollen grains.

3. **Locating the Stomium**:
- The stomium is a specific region in the anther where the pollen grains are released. It is formed by thin-walled cells in the endothecium, particularly at the junction between the two lobes of the anther.

4. **Determining the Correct Answer**:
- The stomium occurs at the groove of each anther lobe. This is where the dehiscence (the opening) of the anther takes place, allowing the pollen grains to be released.

5. **Final Answer**:
- Therefore, the correct answer is: **at the groove of each anther lobe** (Option B).