monocot stem has

Options

A. Bicollateral closed vascular bundles
B. Bicollateral open vascular bundles
C. Collateral apen vascular bundles
D. Collateral closed bascular bundles

Answer

### Step-by-Step Solution:

1. **Understanding Vascular Bundles**:
- Vascular bundles are the arrangements of xylem and phloem in plants. They can be classified into two main types: collateral and bicollateral.

2. **Types of Collateral Bundles**:
- Collateral bundles can be further divided into:
- **Open Collateral Bundles**: These have a cambium layer between the xylem and phloem, allowing for secondary growth.
- **Closed Collateral Bundles**: These lack a cambium layer, meaning they do not allow for secondary growth, and the xylem and phloem are in direct contact.

3. **Understanding Bicollateral Bundles**:
- In bicollateral bundles, there are two phloem tissues located on either side of the xylem, separated by a cambium layer. This structure allows for more complex growth patterns.

4. **Identifying Monocot Stem Characteristics**:
- Monocot stems typically have closed collateral vascular bundles. This means that the xylem and phloem are closely associated without a cambium layer, which is a defining characteristic of monocots.

5. **Conclusion**:
- Based on the classification of vascular bundles, the correct answer to the question about the type of vascular bundles in monocot stems is **closed collateral vascular bundles**.

### Final Answer:
The monocot stem has **closed collateral vascular bundles**.

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