A ridge like structure called raphe is characteristic of which type of ovules?

Options

A. Hemitropous
B. Circinotropous
C. Anatropous
D. All types of ovules

Answer

To determine the type of ovule characterized by a ridge-like structure called the raphe, we can analyze the different types of ovules mentioned in the video transcript.

### Step-by-Step Solution:

1. **Understanding the Term 'Raphe':**
- The raphe is a ridge-like structure found on certain types of ovules. It plays a role in the attachment of the ovule to the ovary wall.

2. **Identifying Types of Ovules:**
- The video mentions three types of ovules: Hemitrophous, Circinotrophous, and Entrotrophous.

3. **Analyzing Hemitrophous Ovule:**
- Hemitrophous ovules are described as having a half-inverted structure. They do not specifically mention the presence of a raphe.

4. **Analyzing Circinotrophous Ovule:**
- Circinotrophous ovules have a long funiculus that wraps around the ovule. The description does not indicate the presence of a raphe.

5. **Analyzing Entrotrophous Ovule:**
- Entrotrophous ovules are characterized by their inverted structure, where the micropyle is directed downwards. The presence of a raphe is not specifically mentioned.

6. **Conclusion:**
- The video states that all three options (Hemitrophous, Circinotrophous, and Entrotrophous) do not describe the ovule with a raphe. Therefore, the answer is that none of the provided options correctly identify the type of ovule characterized by a raphe.

### Final Answer:
- The raphe is characteristic of **Orthotropous ovules** (not mentioned in the options).