How many meiotic divisions are necessary to produce 100 pollen grains ?

Options

A. 20
B. 25
C. 50
D. 100

Answer

To determine how many meiotic divisions are necessary to produce 100 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 results in four daughter cells, each with half the number of chromosomes of the parent cell. This is crucial for gamete formation.

2. **Identify the Output of One Meiotic Division**:
- One meiotic division produces four pollen grains. This means that from one meiotic event, we can obtain four gametes (pollen grains in this case).

3. **Calculate the Number of Meiotic Divisions Needed**:
- To find out how many meiotic divisions are needed to produce 100 pollen grains, we can set up the equation:
\[ \text{Number of meiotic divisions} = \frac{\text{Total pollen grains needed}}{\text{Pollen grains produced per division}} \]
- Plugging in the numbers:
\[ \text{Number of meiotic divisions} = \frac{100}{4} = 25 \]

4. **Conclusion**:
- Therefore, 25 meiotic divisions are necessary to produce 100 pollen grains.

### Final Answer:
25 meiotic divisions are needed to produce 100 pollen grains.