Bundle sheath is absent around vascular bundles of
(a) dicot stem
(b) monocot stem
(c) dicot leaf
(d) monocot leaf

Options

A. dicot stem
B. monocot stem
C. dicot leaf
D. monocot leaf

Answer

To solve the question regarding the absence of bundle sheath around vascular bundles, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Bundle Sheath**:
- A bundle sheath is a layer of cells that surrounds the vascular bundles in plants. It plays a role in the protection and functioning of the vascular tissue.

2. **Analyze Each Option**:
- **Option A: Dicot Stem**:
- In dicot stems, the bundle sheath is indeed absent. This is a characteristic feature of dicotyledonous plants.
- **Option B: Monocot Stem**:
- In monocot stems, the bundle sheath is present and is typically made up of sclerenchyma cells, known as a sclerenchymatous bundle sheath.
- **Option C: Dicot Leaf**:
- In dicot leaves, the bundle sheath is present, often composed of parenchyma or sclerenchyma cells.
- **Option D: Monocot Leaf**:
- In monocot leaves, the bundle sheath is also present and is usually more developed compared to dicot leaves.

3. **Identify the Correct Answer**:
- Based on the analysis, the only option where the bundle sheath is absent is **Option A: Dicot Stem**.

### Final Answer:
The bundle sheath is absent around vascular bundles of **(a) dicot stem**.

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