The types of plastids present in a stem tuber of Solanum tuberosum are

Options

A. chloroplasts
B. chromoplasts
C. leucoplasts
D. all the above

Answer

To answer the question regarding the types of plastids present in a stem tuber of Solanum tuberosum, we can follow these steps:

### Step 1: Understand the types of plastids
Plastids are organelles found in plant cells, and they are classified into different types based on their function and pigment content. The main types of plastids include:
- Chloroplasts: Contain chlorophyll and are involved in photosynthesis.
- Chromoplasts: Contain pigments such as carotenoids and are responsible for the color of fruits and flowers.
- Leucoplasts: Colorless plastids that are involved in the storage of starch, oils, and proteins.

### Step 2: Analyze the options provided
1. **Chloroplast**: These are involved in photosynthesis and contain green pigment. However, they are not typically found in stem tubers as they are not involved in storage.
2. **Chromoplast**: These contain carotenoids and are responsible for the coloration in certain plant parts. They can be present in stem tubers, contributing to their color.
3. **Leucoplast**: These are colorless plastids that store starch, oils, and proteins. They are commonly found in storage organs like tubers.
4. **All of the above**: This option suggests that all types of plastids are present, which is not accurate for stem tubers.

### Step 3: Identify the correct answer
In the case of Solanum tuberosum (potato), the primary types of plastids present in the stem tuber are:
- **Chromoplasts**: For coloration.
- **Leucoplasts**: For storage of starch.

Thus, the correct answer is that **Chromoplasts and Leucoplasts** are the types of plastids present in the stem tuber of Solanum tuberosum.

### Final Answer
The types of plastids present in a stem tuber of Solanum tuberosum are **Chromoplasts and Leucoplasts**.

---