In angiosperm, mature male gametophyte is produced after meiosis and mitosis

Options

A. 1,2
B. 1,1
C. 1,3
D. 1,4

Answer

To solve the question regarding the production of the mature male gametophyte in angiosperms, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding the Microspore Mother Cell**:
- In angiosperms, the male gametophyte develops from a microspore mother cell (microsporocyte), which is diploid (2n).

**Hint**: Remember that the microspore mother cell is the starting point for male gametophyte development.

2. **Meiosis**:
- The microspore mother cell undergoes **one meiotic division**. This division is reductional, meaning it reduces the chromosome number from diploid (2n) to haploid (n).
- This meiotic division results in the formation of **four haploid microspores**.

**Hint**: Meiosis is crucial for reducing the chromosome number and producing haploid cells.

3. **Mitosis**:
- Each of the four haploid microspores undergoes **one mitotic division**. This is an equational division, which means the chromosome number remains the same.
- The first mitotic division in each microspore results in the formation of two cells: a **vegetative cell** and a **generative cell**.

**Hint**: Mitosis helps in the growth and differentiation of cells without changing the chromosome number.

4. **Second Mitosis**:
- The generative cell then undergoes **a second mitotic division**. This division produces **two male gametes** (sperm cells).

**Hint**: The generative cell is crucial for producing the actual male gametes that participate in fertilization.

5. **Final Outcome**:
- Thus, the process of producing a mature male gametophyte involves **1 meiotic division** and **2 mitotic divisions**.

### Conclusion:
- Therefore, the correct answer to the question is **1 in 2**. This indicates that one meiotic division and two mitotic divisions are required for the formation of the mature male gametophyte in angiosperms.