Pollen grain germinates through

Options

A. Micropyle
B. Integument
C. Chalaza
D. Germ pore.

Answer

**Step-by-Step Solution:**

1. **Understanding Pollen Grain Germination**: Pollen grains are the male gametophytes in seed plants and they need to germinate to form a pollen tube that will deliver sperm cells to the ovule for fertilization.

2. **Analyzing the Options**:
- **Micro-pyle**: This is an opening in the ovule that allows the entry of the pollen tube during fertilization, but it is not involved in the germination of the pollen grain itself.
- **Integuments**: These are protective layers surrounding the ovule. They do not play a role in the germination of pollen grains.
- **Glyza**: This refers to the region of the ovule opposite to the micro-pyle and is not related to pollen germination.
- **Germ Pores**: These are specific areas on the pollen grain where the outer layer, called sporopollenin, is absent. This allows for the emergence of the pollen tube during germination.

3. **Identifying the Correct Answer**: Among the options provided, the germ pores are the only structures that facilitate the germination of pollen grains, as they are the sites through which the pollen tube emerges.

4. **Conclusion**: Therefore, the correct answer to the question "Pollen grain germinates through" is **Germ Pores**.

---