Which one of the following is not a plastid ?

Options

A. Aleuroplast
B. Chromoplast
C. Chloroplast
D. Aleurone

Answer

To solve the question "Which one of the following is not a plastid?" we need to analyze the options provided: alluroplast, chromoplast, chloroplast, and alluron.

### Step-by-Step Solution:

1. **Understanding Plastids**:
- Plastids are double membrane-bound organelles found in plant cells and some algal cells. They are not present in animal cells.
- There are different types of plastids, including chloroplasts, chromoplasts, and leucoplasts.

2. **Identifying the Types of Plastids**:
- **Chloroplast**:
- This is the most common type of plastid, containing chlorophyll pigments, and is primarily responsible for photosynthesis.
- **Chromoplast**:
- These plastids contain various colored pigments that give fruits and vegetables their colors. They are involved in the pigmentation of plant parts.
- **Leucoplast**:
- These are non-pigmented plastids primarily involved in storage. They can be further classified into amyloplasts (for starch), proteinoplasts (for proteins), and oleoplasts (for fats).

3. **Analyzing the Options**:
- **Alluroplast**:
- This is another name for proteinoplast, which is a type of leucoplast. Therefore, it is a plastid.
- **Chromoplast**:
- This is a recognized type of plastid responsible for color in plants.
- **Chloroplast**:
- This is a well-known type of plastid involved in photosynthesis.
- **Alluron**:
- This term refers to protein granules found in seeds and tubers. It is not classified as a plastid.

4. **Conclusion**:
- Among the options provided, the one that is not a plastid is **alluron**.

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