Atactostele is present in

Options

A. Dicot stem
B. Monocot stem
C. Dicot root
D. Monocot root

Answer

### Step-by-Step Solution:

1. **Understanding Atactostele**: Atactostele is a specific type of vascular arrangement found in certain plants. It is characterized by having multiple vascular bundles that are scattered throughout the stem rather than being arranged in a ring.

2. **Identifying the Types of Plants**: There are two main groups of flowering plants: monocots and dicots. Monocots typically have a more complex arrangement of vascular bundles, while dicots usually have a more organized, ring-like arrangement.

3. **Analyzing the Options**: The question provides four options:
- A) Dicot stem
- B) Monocot stem
- C) Dicot root
- D) Monocot root

4. **Evaluating Each Option**:
- **Dicot Stem**: Dicot stems usually have a ring arrangement of vascular bundles, not atactostele.
- **Monocot Stem**: Monocots exhibit atactostele, with vascular bundles scattered throughout the stem.
- **Dicot Root**: Dicot roots do not have atactostele; they have a different arrangement.
- **Monocot Root**: While monocot roots can have complex arrangements, atactostele specifically refers to stems.

5. **Conclusion**: Based on the analysis, the correct answer is **B) Monocot stem**, as atactostele is specifically found in the stems of monocot plants.