Route used by pollen tube for entering ovule is

Options

A. integument
B. micropyle
C. chalaza
D. any of the above

Answer

To solve the question regarding the route used by the pollen tube for entering the ovule, we can break down the information provided in the video transcript into clear steps:

### Step-by-Step Solution:

1. **Understanding the Structure of the Ovule**:
- The ovule consists of several parts, including the integuments, micropyle, and the embryo sac. The micropyle is a small opening in the ovule.

2. **Role of the Pollen Tube**:
- The pollen tube is responsible for delivering sperm cells to the ovule for fertilization. It grows from the pollen grain after pollination.

3. **Pathway of the Pollen Tube**:
- The pollen tube typically enters the ovule through the micropyle. This is the primary route for the pollen tube to reach the embryo sac where fertilization occurs.

4. **Other Possible Routes**:
- The transcript mentions two additional terms: "charger" and "integument".
- "Charger" likely refers to a specific mechanism or structure that assists the pollen tube's entry, while "integument" refers to the outer layers of the ovule.

5. **Conclusion**:
- The pollen tube can enter the ovule through the micropyle, and potentially through other structures like the integument and charger. Therefore, the correct answer to the question is that the pollen tube can enter the ovule using any of the mentioned routes.

### Final Answer:
- The route used by the pollen tube for entering the ovule is **D) Any of the above**.

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