In Angiosperms, the functional megaspore of a linear tetrad is the

Options

A. First nearest to the micropyle
B. Second from micropyle
C. Third from micropyle
D. Fourth from micropyle

Answer

To solve the question about the functional megaspore of a linear tetrad in angiosperms, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Megasporogenesis**: In angiosperms, the process begins with a megaspore mother cell (megaspore mother cell) undergoing meiosis. This results in the formation of four haploid cells.

2. **Formation of Linear Tetrad**: The four haploid cells formed after meiosis are arranged in a linear fashion, which is referred to as a linear tetrad.

3. **Identifying the Micropile**: The micropile is a specific end of the ovule where the entrance for the pollen tube occurs. It is important to note the position of the micropile in relation to the arrangement of the megaspores.

4. **Determining the Functional Megaspore**: Among the four haploid cells in the linear tetrad, the functional megaspore is the one that is farthest from the micropile. This is because, during development, only one of the megaspores will survive and develop into the embryo sac.

5. **Conclusion**: Therefore, the functional megaspore of a linear tetrad is the fourth megaspore from the micropile end.

### Answer:
The functional megaspore of a linear tetrad in angiosperms is the **fourth from the micropile**.

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