How many meiotic divisions are required to produce 1000 pollen grains

Options

A. 250
B. 500
C. 1000
D. 1250

Answer

To determine how many meiotic divisions are required to produce 1000 pollen grains, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Meiosis**:
- Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four daughter cells from one parent cell. In the case of pollen grains, the microspore mother cells (which are diploid) undergo meiosis to produce haploid microspores.

2. **Identify the Outcome of One Meiotic Division**:
- Each meiotic division of a microspore mother cell results in the formation of 4 pollen grains (haploid microspores).

3. **Calculate the Number of Meiotic Divisions Needed**:
- To find out how many meiotic divisions are needed to produce 1000 pollen grains, we can use the formula:
\[ \text{Number of meiotic divisions} = \frac{\text{Total pollen grains}}{\text{Pollen grains produced per division}} \]
- Substituting the values:
\[ \text{Number of meiotic divisions} = \frac{1000}{4} = 250 \]

4. **Conclusion**:
- Therefore, to produce 1000 pollen grains, 250 meiotic divisions are required.

### Final Answer:
- The correct answer is **250** meiotic divisions.

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