In which of the following the pollen tube enters via chalaza ?

Options

A. Ottelia
B. Casuarina
C. Cucurbita
D. Both ( A) and ( C)

Answer

To solve the question "In which of the following does the pollen tube enter via chalaza?", we need to understand the concept of chalazogamy and identify the correct examples.

### Step-by-Step Solution:

1. **Understand Chalazogamy**:
- Chalazogamy is a type of fertilization where the pollen tube enters the ovule through the chalaza. The chalaza is the part of the ovule opposite the micropyle.

2. **Identify the Options**:
- The options given are:
- A) Otilia
- B) Casuarina
- C) Curcubita
- D) Both A and C

3. **Analyze Each Option**:
- **Otilia**: This is not a well-known example of chalazogamy.
- **Casuarina**: This plant is known to exhibit chalazogamy, where the pollen tube enters through the chalaza.
- **Curcubita**: This plant does not exhibit chalazogamy; instead, it is known for mesogamy, where the pollen tube enters through the integuments.
- **Both A and C**: Since neither Otilia nor Curcubita shows chalazogamy, this option is incorrect.

4. **Conclusion**:
- The only correct example where the pollen tube enters via chalaza is **Casuarina**. Therefore, the correct answer to the question is **B) Casuarina**.

### Final Answer:
The pollen tube enters via chalaza in **Casuarina**.

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