What is the function of germ pore?

Options

A. Emergence of radicle
B. Absorption of water for seed germination
C. Initiation of pollen tube
D. All of these

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure of Pollen Grain:**
- Pollen grains are the male gametophytes in flowering plants. They have a protective outer layer called the exine, which is made of a tough substance called sporopollenin.

2. **Identifying the Germ Pore:**
- The germ pore is a specific area on the exine where sporopollenin is absent. This makes the germ pore a unique feature of the pollen grain.

3. **Function of the Germ Pore:**
- The primary function of the germ pore is to facilitate the emergence of the pollen tube. The pollen tube is crucial for the fertilization process as it transports the male gametes to the ovary of the flower.

4. **Process of Pollen Tube Formation:**
- When pollen lands on a compatible stigma, it germinates, and the pollen tube begins to grow from the germ pore. This tube then extends down the style to reach the ovary, allowing the male gametes to travel and fertilize the ovule.

5. **Conclusion:**
- In summary, the germ pore serves as the exit point for the pollen tube, enabling the transfer of male gametes to the ovary for fertilization.

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