100 pollen grains are produced from how many microspore mother cells?

Options

A. 50
B. 25
C. 100
D. 75

Explanation

To solve the problem of how many microspore mother cells are needed to produce 100 pollen grains, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Microspore Mother Cells**:
- Microspore mother cells (also known as microsporocytes) undergo meiosis to produce microspores.

2. **Determine the Outcome of Meiosis**:
- Each microspore mother cell divides through meiosis to produce 4 microspores.

3. **Relate Microspores to Pollen Grains**:
- Each microspore eventually develops into a pollen grain. Therefore, 1 microspore gives rise to 1 pollen grain.

4. **Calculate the Number of Microspore Mother Cells Needed**:
- If 1 microspore mother cell produces 4 pollen grains, we can set up the equation:
\[ \text{Number of pollen grains} = \text{Number of microspore mother cells} \times 4 \]
- To find out how many microspore mother cells are needed to produce 100 pollen grains, we rearrange the equation:
\[ \text{Number of microspore mother cells} = \frac{\text{Number of pollen grains}}{4} \]
- Substituting the known value:
\[ \text{Number of microspore mother cells} = \frac{100}{4} = 25 \]

5. **Conclusion**:
- Therefore, to produce 100 pollen grains, 25 microspore mother cells are required.

### Final Answer:
- The answer is **25 microspore mother cells**.