Number of meiosis required to produce 100 megaspore in angiosperms is

Options

A. 125
B. 100
C. 25
D. 75

Answer

To determine the number of meiosis required to produce 100 megaspores in angiosperms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Megaspore Mother Cell**:
- In angiosperms, the megaspore mother cell (MMC) undergoes meiosis to produce megaspores.

2. **Meiotic Division Outcome**:
- Each megaspore mother cell undergoes meiosis and produces a total of 4 megaspores.

3. **Functional Megaspores**:
- Out of the 4 megaspores produced, only 1 megaspore is functional. The other 3 megaspores degenerate and do not contribute to the formation of the female gametophyte.

4. **Calculating the Number of Megaspore Mother Cells Needed**:
- Since only 1 out of the 4 megaspores produced by each megaspore mother cell is functional, to produce 100 functional megaspores, we need 100 megaspore mother cells.

5. **Meiosis Required**:
- Each megaspore mother cell undergoes 1 meiotic division to produce 4 megaspores. Therefore, to produce 100 functional megaspores, we need 100 meiotic divisions (one for each megaspore mother cell).

### Final Answer:
- The number of meiosis required to produce 100 megaspores in angiosperms is **100**.