In a young anther the four rows of cells which later produce pollen are called

Options

A. Antheridium
B. Archesporium
C. Tapetum
D. Zoosporangium.

Answer

To solve the question regarding the four rows of cells in a young anther that later produce pollen, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of a Young Anther**:
- A young anther initially consists of a homogeneous mass of parenchymatous cells, which are covered by an epidermis (the outermost layer).

2. **Formation of Lobes**:
- As the anther develops, it divides to form a four-lobed structure. Each lobe contains a hypodermal region.

3. **Division of Hypodermal Cells**:
- The hypodermal region of the anther divides to form archesporium cells. These cells are crucial as they will eventually give rise to pollen.

4. **Differentiation of Archesporium Cells**:
- The archesporium cells further divide to form two types of cells: outer parietal cells and inner parietal cells.
- The outer parietal cells will contribute to the formation of the layers of the anther, including the endothecium and middle layer, while the innermost layer is called the tapetum.

5. **Formation of Pollen**:
- The inner parietal cells will lead to the formation of sporangial cells and microspore mother cells.
- These microspore mother cells undergo meiotic divisions to produce microspores, which develop into pollen grains.

6. **Identifying the Correct Term**:
- The question asks for the term that refers to the four rows of cells that produce pollen. The correct term for these cells is "archesporium."

7. **Conclusion**:
- Therefore, the correct answer to the question is **archesporium**.

### Final Answer:
The four rows of cells in a young anther that later produce pollen are called **archesporium**.

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