In angiosperms, formation of two male gametes from a pollen grain involves- divisions

Options

A. One mitotic and one mitotic
B. Two meiotic and two mitotic
C. Only two mitotic.
D. Only two meiotic.

Answer

To solve the question regarding the formation of two male gametes from a pollen grain in angiosperms, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding the Starting Point**:
- In angiosperms, the process begins with a diploid microsporocyte (microspore mother cell).

2. **Meiosis**:
- The diploid microsporocyte undergoes meiosis. This is a two-step division process:
- **Meiosis I**: The diploid cell divides to form two haploid cells.
- **Meiosis II**: Each of these haploid cells divides again, resulting in a total of four haploid microspores.

3. **Formation of Pollen Grains**:
- The four haploid microspores can either remain together or separate. When they separate, they form individual pollen grains.

4. **Mitosis**:
- Each haploid pollen grain undergoes mitosis (a single division) to produce two male gametes. This means that from one pollen grain, two male gametes are formed.

5. **Conclusion**:
- Therefore, the formation of two male gametes from a pollen grain involves one meiotic division (to produce the haploid microspores) followed by one mitotic division (to produce the two male gametes).

### Final Answer:
The correct answer is: **One meiotic and one mitotic division**.