Entry of pollen tube through chalazal end is

Options

A. Syngamy
B. Porogamy
C. Mesogamy
D. Chalazogamy.

Answer

To solve the question regarding the entry of the pollen tube through the chalazal end, we will analyze each option provided and determine the correct term.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the entry of the pollen tube through the chalazal end of the ovule.

2. **Analyzing the Options**:
- **Option 1: Syngamy**: This term refers to the fusion of male and female gametes, which leads to the formation of a diploid zygote. Since this is about fusion and not entry, this option is incorrect.

- **Option 2: Porogamy**: This term describes the entry of the pollen tube into the ovule through the micropyle. Since the question specifies the chalazal end, this option is also incorrect.

- **Option 3: Mesogamy**: This term relates to the entry of the pollen tube through the integument or the nucellus of the ovule. Again, this does not pertain to the chalazal end, making this option incorrect as well.

- **Option 4: Chalazogamy**: This term specifically refers to the entry of the pollen tube into the ovule through the chalazal end. This is the correct answer.

3. **Conclusion**: After analyzing all the options, the correct term for the entry of the pollen tube through the chalazal end is **Chalazogamy**.

### Final Answer:
The entry of the pollen tube through the chalazal end is termed as **Chalazogamy**.

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