Cell walls impregnated with water repellent suberin are found in the cells of -

Options

A. Endodermis
B. Pericycle
C. trancheids
D. root hairs

Answer

To solve the question regarding which cells have cell walls impregnated with the water-repellent substance suberin, we can follow these steps:

### Step 1: Understand the term "impregnated"
The term "impregnated" in this context refers to the deposition of a substance, in this case, suberin, within the cell walls. Suberin is a hydrophobic (water-repelling) substance that helps in regulating water movement.

**Hint:** Think about what "impregnated" means in biological terms, especially in relation to cell walls.

### Step 2: Identify the relevant cell types
We need to consider the different types of cells mentioned in the options: endodermis, pericycle, tracheids, and root hairs.

**Hint:** Recall the functions and characteristics of each of these cell types.

### Step 3: Focus on the endodermis
The endodermis is a layer of cells in the root that acts as a selective barrier. It has a special structure called the Casparian strip, which is made of suberin. This strip prevents water from moving freely between the cells and forces it to pass through the cell membranes, thus controlling the flow of water and minerals into the xylem.

**Hint:** Consider the role of the endodermis in water regulation and the presence of the Casparian strip.

### Step 4: Evaluate the other options
- **Pericycle**: This layer is involved in the formation of lateral roots and does not have suberin impregnated walls.
- **Tracheids**: These are water-conducting cells in the xylem, and while they are involved in water transport, they do not have suberin in their walls.
- **Root hairs**: These are extensions of root epidermal cells that absorb water and nutrients from the soil and do not have suberin.

**Hint:** Analyze the functions of pericycle, tracheids, and root hairs to determine if they have suberin.

### Step 5: Conclusion
Based on the analysis, the correct answer is **endodermis**. The endodermal cells have walls impregnated with suberin, which helps regulate water movement into the plant.

**Final Answer:** The cell walls impregnated with water-repellent suberin are found in the **endodermis**.