Which of the following layer in dicot stem provies mechanical strength to the young stem?

Options

A. Epidermis
B. Hypodermis
C. Endodermis
D. Cortical layer

Explanation

To determine which layer in a dicot stem provides mechanical strength to the young stem, we can analyze the different layers present in the stem. Here’s a step-by-step solution:

### Step 1: Identify the Layers of the Dicot Stem
The main layers of a dicot stem include:
- Epidermis
- Hypodermis
- Cortex (including parenchyma)
- Endodermis
- Vascular bundles (xylem and phloem)

### Step 2: Understand the Function of Each Layer
- **Epidermis**: This is the outermost layer that primarily provides protection. It does not contribute significantly to mechanical strength.
- **Hypodermis**: This layer is made up of collenchyma cells, which are known for their mechanical support due to their thickened cell walls.
- **Cortex**: Generally involved in storage and does not provide mechanical strength.
- **Endodermis**: Primarily functions in regulating the flow of water and nutrients; it does not provide mechanical strength.
- **Vascular Bundles**: While they are important for transport, they do not provide mechanical strength in the young stem.

### Step 3: Focus on the Hypodermis
The hypodermis, composed of collenchyma cells, provides mechanical strength. These cells are characterized by:
- Thickened cell walls made of cellulose, hemicellulose, and pectin.
- Elasticity and flexibility, allowing the stem to withstand bending forces without breaking.

### Step 4: Conclusion
Given that the question asks for the layer that provides mechanical strength to the young stem, the correct answer is the **hypodermis**.

### Final Answer
The layer in the dicot stem that provides mechanical strength to the young stem is the **hypodermis**.

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