For the formation of 40 embryo sacs, how many meiotic divisions, in all are required?

Options

A. 40
B. 50
C. 60
D. 80

Answer

To solve the problem of how many meiotic divisions are required for the formation of 40 embryo sacs, we can follow these steps:

### Step 1: Understand the Formation of Embryo Sacs
- Embryo sacs are formed from megaspore mother cells (MMC).
- Each MMC undergoes meiosis to produce four megaspores.

### Step 2: Determine the Fate of Megaspores
- Out of the four megaspores produced, depending on the type of development:
1. **Monosporic Development**: 3 megaspores degenerate, and 1 remains functional.
2. **Bisporic Development**: 2 megaspores degenerate, and 2 remain functional.
3. **Tetrasporic Development**: All 4 megaspores remain functional.

- Regardless of the type of development, only **one embryo sac** is produced from one MMC.

### Step 3: Calculate the Number of Meiotic Divisions
- Since one MMC is required to produce one embryo sac and it undergoes one meiotic division:
- For 40 embryo sacs, we need 40 MMCs.
- Therefore, we need 40 meiotic divisions (one for each MMC).

### Conclusion
- The total number of meiotic divisions required for the formation of 40 embryo sacs is **40**.

### Final Answer
- **40 meiotic divisions are required for the formation of 40 embryo sacs.**

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