Give correct term for the following statements:
When pollen tube pierces through integuments of the embryo sac to reach the ovule.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Structure**: Begin by recognizing the components involved in the process of fertilization in flowering plants. The key structures include the stigma, style, ovary, ovules, and the embryo sac.

2. **Pollen Tube Formation**: After pollination, when pollen grains land on the stigma, they germinate and form a pollen tube. This tube is essential for delivering male gametes to the female gametes present in the embryo sac.

3. **Pathways of Pollen Tube Entry**: The pollen tube can enter the ovule through three different pathways:
- **Chalazogamy**: When the pollen tube enters through the chalaza (the end opposite the micropyle).
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