The number of male gametes and the number of meiotic divisions required for the formation of 100 seeds in a typical angiosperm is

Options

A. 100 male gametes and 125 meiotic division
B. 200 male gametes and 125 meiotic divisions
C. 100 male gametes and 25 meiotic divisions
D. 200 male gametes and 25 meiotic divisions

Answer

To solve the problem regarding the number of male gametes and the number of meiotic divisions required for the formation of 100 seeds in a typical angiosperm, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Gamete Formation**:
- In angiosperms, male gametes are produced from microspores (pollen grains) through meiotic divisions. Each meiotic division results in four haploid spores (microspores).

2. **Calculating Male Gametes**:
- For the formation of 100 seeds, we need 100 male gametes (one male gamete for each seed).
- Since each meiotic division produces 4 male gametes, we can calculate the number of meiotic divisions required to produce 100 male gametes:
\[ \text{Number of meiotic divisions} = \frac{100 \text{ male gametes}}{4 \text{ male gametes per division}} = 25 \text{ meiotic divisions} \]

3. **Understanding Female Gamete Formation**:
- Female gametes are produced from ovules, where one meiotic division results in one functional female gamete (egg) and three non-functional cells.
- Therefore, to produce 100 female gametes (one for each seed), we need 100 meiotic divisions.

4. **Total Meiotic Divisions**:
- The total number of meiotic divisions required for the formation of both male and female gametes is:
\[ \text{Total meiotic divisions} = \text{Meiotic divisions for male gametes} + \text{Meiotic divisions for female gametes} = 25 + 100 = 125 \]

5. **Final Answer**:
- The number of male gametes required is 100.
- The total number of meiotic divisions required is 125.
- Therefore, the correct option is **100 male gametes and 125 meiotic divisions**.

### Summary:
- **Number of Male Gametes**: 100
- **Number of Meiotic Divisions**: 125