The device that guides the pollen tube in the cavity of ovary is

Options

A. Obturator occurs in the ovary
B. Transmitting tissue
C. Placenta
D. Synergids.

Answer

To solve the question about the device that guides the pollen tube in the cavity of the ovary, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the specific structure that helps guide the pollen tube within the ovary.

2. **Identifying the Options**: The options provided are:
- A) Obturator
- B) Transmitting tissues
- C) Placenta
- D) Synergids

3. **Analyzing Each Option**:
- **Transmitting Tissues**: These are involved in the transport of nutrients but do not specifically guide the pollen tube.
- **Placenta**: This is the tissue that connects the ovule to the ovary wall but does not guide the pollen tube.
- **Synergids**: These are two cells located near the egg cell in the ovule that help in the guidance of the pollen tube but are not the primary structure for guiding it through the ovary.
- **Obturator**: This is a structure that acts as a placental outgrowth at the micropilar end of the ovule. It specifically helps in directing the pollen tube towards the micropilar end of the ovule.

4. **Conclusion**: Based on the analysis, the structure that guides the pollen tube in the cavity of the ovary is the **Obturator**.

5. **Final Answer**: The correct answer is **Obturator**.