Where are casparian rings found?

Explanation

**Step-by-Step Solution:**

1. **Understanding Casparian Rings**: Casparian rings are specific structures found in plant roots. They are not just any rings; they are special strips that have a unique composition.

2. **Location of Casparian Rings**: These rings are located in the roots of all higher plants. This means they are present in the roots of vascular plants, which include flowering plants and other types of plants that have a complex structure.

3. **Structure of Casparian Rings**: Casparian rings are made up of hydrophobic (water-repelling) materials. This characteristic is important because it helps regulate the movement of water and nutrients into the plant.

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