Describe the role of casparian strips in roots.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Casparian Strips**:
Casparian strips are bands of cell wall material found in the roots of plants. Specifically, they are located in the endodermal cells, where they form thickened regions on the radial and transverse walls.

**Hint**: Remember that Casparian strips are not just any part of the root; they are specifically found in the endodermis.

2. **Composition**:
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