How many meiotic divisions are necessary for formation of 100 functional megaspores:-

Options

A. 25
B. 50
C. 100
D. 200

Answer

To determine how many meiotic divisions are necessary for the formation of 100 functional megaspores, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Megaspore Mother Cell**:
- A megaspore mother cell (also known as a megasporocyte) is a diploid cell (2n) in plants that undergoes meiosis to produce megaspores.

2. **Meiosis Process**:
- Meiosis is a reduction division that results in the formation of four haploid cells (n) from one diploid cell (2n).

3. **Functional Megaspores**:
- In flowering plants (angiosperms) and gymnosperms, out of the four haploid megaspores produced, only one megaspore is functional. The other three degenerate.

4. **Calculating Required Meiotic Divisions**:
- Since one meiotic division produces four megaspores, but only one of them is functional, to obtain 100 functional megaspores, we need to perform 100 meiotic divisions.
- This is because each meiotic division yields one functional megaspore.

5. **Conclusion**:
- Therefore, to produce 100 functional megaspores, **100 meiotic divisions** are necessary.

### Final Answer:
100 meiotic divisions are necessary for the formation of 100 functional megaspores.

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