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 which type of ovules is characterized by a ridge-like structure called raphe, we can analyze the different types of ovules and their characteristics step by step.

### Step-by-Step Solution:

1. **Understanding the Term "Raphe":**
- The raphe is a ridge-like structure that forms as a result of the fusion between the funicle (the stalk of the ovule) and the body of the ovule.

2. **Identifying Types of Ovules:**
- There are several types of ovules, including:
- **Hematropous:** This type of ovule is half-inverted.
- **Circinotropous:** In this type, the funicle completely envelops the ovule.
- **Anatropous:** This is where the ovule is inverted, and the raphe is prominently formed.

3. **Analyzing Each Option:**
- **Hematropous:** Since it is half-inverted, it does not typically exhibit a raphe.
- **Circinotropous:** The funicle covers the ovule completely, which does not lead to the formation of a raphe.
- **Anatropous:** This type of ovule is characterized by its inverted position, and it is here that the raphe is formed due to the fusion of the funicle and the ovule body.

4. **Conclusion:**
- Based on the analysis, the correct answer is that the ridge-like structure called raphe is characteristic of **Anatropous ovules**.

### Final Answer:
**Anatropous ovules** are characterized by the presence of a ridge-like structure called raphe.

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