In a mautre angiospermic male gametophyte, the male gametes are present in the

Options

A. Pollen grain part
B. Base of pollen tube
C. All over inside the male gametophyte
D. Tip of the pollen tube.

Answer

To solve the question regarding the location of male gametes in a mature angiospermic male gametophyte, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of Pollen Grain**:
- Pollen grains are the male gametophytes in angiosperms. Each pollen grain contains the male gametes.

2. **Pollen Germination**:
- When pollen grains land on the stigma of a flower, they absorb moisture and germinate. This process leads to the formation of a pollen tube.

3. **Emergence of Pollen Tube**:
- The pollen tube emerges from the pollen grain through openings called germ pores. The entire content of the pollen grain, including the male gametes, moves into the pollen tube.

4. **Zones of the Pollen Tube**:
- The growing pollen tube has four distinct zones:
- **Apical Zone**: Contains vesicles.
- **Sub-apical Zone**: Contains granular cytoplasm and cell organelles.
- **Nuclear Zone**: This is where the male gametes (sperms) are located. It contains a vegetative nucleus and two sperm cells.
- **Vacuolization Zone**: This zone helps prevent the backflow of contents into the pollen grain.

5. **Conclusion**:
- The male gametes are specifically located in the **nuclear zone** of the pollen tube, which is at the tip of the pollen tube. Therefore, the correct answer to the question is that the male gametes are present at the **tip of the pollen tube**.

### Final Answer:
The male gametes in a mature angiospermic male gametophyte are present at the **tip of the pollen tube**.

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