In general, pollen tube enter the ovule through

Options

A. micropyle
B. chalaza
C. hilum
D. funicle

Answer

To answer the question "In general, pollen tube enters the ovule through," we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Structure of the Ovule**:
- The ovule has several parts, including the micropyle, chalaza, hilum, and funicle. Each of these parts plays a different role in the reproductive process.

2. **Identifying the Main Entry Point**:
- The primary entry point for the pollen tube into the ovule is through the micropyle. This is the most common pathway for fertilization.

3. **Defining the Process**:
- The entry of the pollen tube through the micropyle is known as **porogamy**. This is the typical method of pollen tube penetration in most flowering plants.

4. **Considering Other Entry Points**:
- While the micropyle is the most common entry point, there are rare instances where the pollen tube may enter through other parts:
- **Chalaza**: This is a less common entry point, known as **chalazogamy**, and occurs in some specific species, such as Casuarina.
- **Integuments**: In very rare cases, the pollen tube can enter through the integuments, a process referred to as **mesogamy**, which is observed in plants like cucurbits.
- **Hilum and Funicle**: The pollen tube does not enter through the hilum or funicle.

5. **Conclusion**:
- Based on the information above, the correct answer to the question is that the pollen tube generally enters the ovule through the **micropyle**.

### Final Answer:
The pollen tube enters the ovule through the micropyle.

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