Select the structures which are formed after differentiation. Secondary phloem, root cap, secondary xylem and trichomes.

Explanation

To solve the question of which structures are formed after differentiation, we will analyze each of the given options: secondary phloem, root cap, secondary xylem, and trichomes.

### Step-by-Step Solution:

1. **Understanding Differentiation**:
- Differentiation is the biological process where precursor cells develop into specialized cells. This process results in the formation of various cell types that perform distinct functions in the plant.

2. **Identifying the Structures**:
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