The residual, persistent nucellus is called:

Options

A. Perisperm
B. Integument
C. Pericarp
D. None of the above

Answer

To answer the question "The residual, persistent nucellus is called:", we need to analyze the options provided and understand the definitions of each term.

### Step-by-Step Solution:

1. **Understanding Nucellus**:
- The nucellus is the central part of an ovule, which contains the female gametophyte. It is the tissue that surrounds the developing embryo sac.

2. **Analyzing the Options**:
- **Perisperm**: This is a nutritive tissue that surrounds the embryo sac and is derived from the nucellus. It is distinct from endosperm and is found in some seeds, such as black pepper.
- **Integument**: This is the protective layer of cells that surrounds the ovule. It is not the residual nucellus but rather a protective structure.
- **Pericarp**: This refers to the wall of the fruit that develops from the ovary after fertilization. It is made up of three layers: exocarp, mesocarp, and endocarp. It does not relate to the nucellus.
- **None of the Above**: This option implies that none of the previous options are correct.

3. **Identifying the Correct Answer**:
- The term that refers to the residual, persistent nucellus is **perisperm**. It is the tissue that remains after the ovule has developed and is responsible for providing nutrition to the developing embryo.

### Final Answer:
The correct answer is **perisperm**.

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