What are brassinosteroids?

Explanation

**Step-by-Step Solution:**

1. **Definition of Brassinosteroids**: Brassinosteroids are a class of steroid hormones found in plants. They play a crucial role in various growth and developmental processes.

2. **Nature of Brassinosteroids**: These hormones are characterized as steroid plant hormones, which means they are derived from cholesterol and have a similar structure to animal steroids.

3. **Effects on Roots**: One of the notable effects of Brassinosteroids is their inhibitory effect on root growth. This means that while they promote growth in other areas, they can suppress root development.

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