Water impermeable, waxy material suberin in the form of strips is present in the
1 Root epidermis
2 Root endodermis
3 Stem epidermis
4 Stem endodermis

Options

A. Root epidermis
B. Root endodermis
C. Stem epidermis
D. Stem endodermis

Answer

To solve the question regarding the presence of the water impermeable, waxy material suberin in the form of strips, we need to analyze the options provided:

1. **Root epidermis**
2. **Root endodermis**
3. **Stem epidermis**
4. **Stem endodermis**

### Step-by-Step Solution:

**Step 1: Understand the structure of a dicot root.**
- The outermost layer of a dicot root is the epidermis, which serves as a protective layer. Beneath the epidermis is the cortex, and the innermost layer of the cortex is the endodermis.

**Hint:** Remember the layers of a dicot root: epidermis → cortex → endodermis.

**Step 2: Identify the function of the endodermis.**
- The endodermis is crucial for regulating the movement of water and minerals into the vascular system of the plant. It contains a special structure called the Casparian strip.

**Hint:** Focus on the role of the endodermis in water and mineral uptake.

**Step 3: Define the Casparian strip.**
- The Casparian strip is a band of suberin, a waxy substance that is impermeable to water. This strip is found in the endodermis and helps prevent water loss and regulates the uptake of water and minerals.

**Hint:** Recall that the Casparian strip is specifically associated with the endodermis and is made of suberin.

**Step 4: Analyze the options based on the above information.**
- **Root epidermis:** Does not contain the Casparian strip.
- **Root endodermis:** Contains the Casparian strip made of suberin.
- **Stem epidermis:** Does not contain the Casparian strip.
- **Stem endodermis:** While it may have similar structures, the question specifically asks about the presence of the Casparian strip in roots.

**Hint:** Eliminate options that do not relate to the endodermis.

**Step 5: Conclusion.**
- Based on the analysis, the correct answer is **Option 2: Root endodermis**, as it is the layer that contains the Casparian strip made of suberin.

### Final Answer:
**Option 2: Root endodermis**