Entry of pollen tube through micropyle is

Options

A. chalazogamy
B. mesogamy
C. porogamy
D. pseudogamy

Explanation

To answer the question regarding the entry of the pollen tube through the micropyle, we need to analyze the options provided: Chalazogamy, Mesogamy, Porogamy, and Pseudogamy.

### Step-by-Step Solution:

1. **Understanding Chalazogamy**:
- Chalazogamy refers to the entry of the pollen tube through the chalazal end of the ovule.
- Example: Cassowarya.
- This option is not correct for our question since we are looking for entry through the micropyle.

2. **Understanding Mesogamy**:
- Mesogamy involves the pollen tube entering through the integuments of the ovule.
- Examples include plants from the Cucurbitaceae family and Conicurseus.
- This option is also not correct as it does not involve the micropyle.

3. **Understanding Porogamy**:
- Porogamy is the process where the pollen tube enters the ovule through the micropyle.
- Since the micropyle is indeed a pore, this option fits perfectly with the question.
- Examples of plants exhibiting porogamy include many angiosperms.
- This is the correct answer.

4. **Understanding Pseudogamy**:
- Pseudogamy refers to a false fusion, where fertilization does not occur in the traditional sense.
- This option is not relevant to the entry of the pollen tube through the micropyle.

### Conclusion:
The correct answer to the question "Entry of pollen tube through micropyle is" is **Porogamy**.

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