An ovule with well developed nucellus is called as

Options

A. Crassinucellate
B. Tenuinucellate
C. Pseudonucellate
D. Anucellate

Answer

To solve the question "An ovule with well-developed nucellus is called as," we will analyze the options provided and understand the definitions of each term related to ovule classification.

### Step-by-Step Solution:

1. **Understanding Nucellus**:
- The nucellus is the central part of the ovule, which contains the megasporangium. It is crucial for the development of the female gametophyte.

2. **Classifying Ovules**:
- Ovules can be classified based on the number of cell layers present between the epidermis and the megasporophyte (the tissue that produces the megaspores).

3. **Analyzing the Options**:
- **Crassi-nucelate**: This type of ovule has two or more cell layers between the epidermis and the megasporophyte. This indicates a well-developed nucellus.
- **Tenu-nucelate**: This type of ovule has only one cell layer between the epidermis and the megasporophyte, indicating a less developed nucellus.
- **Pseudo-nucelate**: This term suggests a false nucellus. It implies that there is an absence of a proper cell layer, which does not correspond to a well-developed structure.
- **Er-nucelate**: This term is not commonly recognized in the context of ovule classification.

4. **Conclusion**:
- Based on the definitions, the only option that indicates a well-developed nucellus is **Crassi-nucelate**. Therefore, the answer to the question is **Crassi-nucelate**.

### Final Answer:
An ovule with well-developed nucellus is called **Crassi-nucelate**.