Vascular bundle in monocot stem is surrounded by ................ sheath.

Answer

To answer the question "Vascular bundle in monocot stem is surrounded by ................ sheath," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Vascular Bundles**: Vascular bundles are the structures that contain the xylem and phloem, which are responsible for the transport of water, nutrients, and food in plants.

2. **Identifying Monocots**: Monocots, or monocotyledons, are a group of flowering plants characterized by having one seed leaf (cotyledon). Examples include grasses, lilies, and palms.

3. **Closed Vascular Bundles**: In monocot stems, the vascular bundles are referred to as "closed vascular bundles." This means that there is no cambium present between the xylem and phloem.

4. **Surrounding Sheath**: The closed vascular bundles in monocot stems are surrounded by a specific type of tissue. In this case, it is surrounded by a "sclerenchymatous sheath." Sclerenchyma is a type of supportive tissue in plants that provides strength and rigidity.

5. **Final Answer**: Therefore, the vascular bundle in a monocot stem is surrounded by a sclerenchymatous sheath.

### Answer:
Vascular bundle in monocot stem is surrounded by **sclerenchymatous sheath**.