In angiosperms the number of meiotic divisions required to produce 100 macrospores is

Options

A. 125
B. 100
C. 50
D. 25

Answer

To solve the question regarding the number of meiotic divisions required to produce 100 macrospores in angiosperms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terminology**:
- In angiosperms, macrospores are also known as megaspores.
- The megaspore mother cell (MMC) is diploid (2N) and undergoes meiosis to produce megaspores.

2. **Meiotic Process**:
- A single megaspore mother cell undergoes meiosis, which consists of two meiotic divisions (Meiosis I and Meiosis II).
- During these divisions, the MMC produces four haploid nuclei (N).

3. **Degeneration of Megaspores**:
- Out of the four haploid nuclei produced, three degenerate, leaving only one functional megaspore.
- Therefore, from one megaspore mother cell, only one megaspore is produced after meiosis.

4. **Calculating the Required Meiotic Divisions**:
- To produce 100 megaspores, we need 100 megaspore mother cells because each MMC produces only one megaspore.
- Since each megaspore mother cell undergoes one meiotic division to produce one megaspore, we will need 100 meiotic divisions for 100 megaspores.

5. **Conclusion**:
- Thus, the number of meiotic divisions required to produce 100 macrospores is **100**.

### Final Answer:
The correct answer is **100**.

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