Which of the following is observed in casuarina?

Options

A. Mesogamy
B. Chalazogamy
C. Porogamy
D. More than one option is correct

Answer

To determine which of the following processes is observed in Casuarina, we need to analyze the definitions and examples of the terms given.

### Step-by-Step Solution:

1. **Understanding Mesogamy**:
- Mesogamy is a type of fertilization where the pollen tube enters the ovule through the integument.
- **Example**: This process is observed in Cucurbits (like cucumber).

2. **Understanding Chalazogamy**:
- Chalazogamy refers to the entry of the pollen tube into the ovule through the chalaza, which is the part of the ovule opposite the micropyle.
- **Example**: This process is observed in Casuarina.

3. **Understanding Porogamy**:
- Porogamy is the process where the pollen tube enters the ovule through the micropyle, which is the opening at the end of the ovule.
- **Example**: This is commonly found in Angiosperms.

4. **Analyzing the Options**:
- The question asks which of these processes is observed in Casuarina.
- From our analysis, we found that Chalazogamy is specifically mentioned as being observed in Casuarina.

5. **Conclusion**:
- Therefore, the correct answer to the question is Chalazogamy, which is the second option.

### Final Answer:
Chalazogamy is observed in Casuarina.