Stem cells are

Options

A. permanent cells in plants
B. undifferentiated cells
C. not capatable of division and development
D. all of the above

Answer

### Step-by-Step Solution

1. **Understanding Stem Cells**: Stem cells are unique cells in multicellular organisms that have the ability to develop into various types of cells. They are characterized by their undifferentiated state, meaning they do not have a specific function or role yet.

2. **Types of Stem Cells**: There are two main types of stem cells:
- **Embryonic Stem Cells**: These are found in the early stages of development, specifically in the inner cell mass of the blastocyst. They have the potential to differentiate into any cell type in the body.
- **Adult Stem Cells**: These are found in various tissues in adults, such as in the bone marrow and gonads. They can also differentiate into specific cell types but are generally more limited compared to embryonic stem cells.

3. **Key Features of Stem Cells**:
- **Undifferentiated**: Stem cells do not have a specific function and can develop into different types of cells.
- **Proliferation**: They can divide and replicate indefinitely, producing more stem cells.

4. **Evaluating the Options**:
- **Option A**: "Permanent cells in plants" - This is incorrect because stem cells are not permanent cells; they can divide and differentiate.
- **Option B**: "Undifferentiated cells" - This is correct as stem cells are indeed undifferentiated.
- **Option C**: "Not capable of division" - This is incorrect because stem cells are capable of division.
- **Option D**: "All of the above" - This is incorrect since not all previous statements are true.

5. **Conclusion**: The correct answer is **Option B: Undifferentiated cells**.