Trapa possesses .................. roots.

Explanation

**Step-by-Step Solution:**

1. **Identify the Plant**: The question asks about the type of roots present in the Trapa plant. Trapa is commonly known as water chestnut.

2. **Understand Root Types**: Roots can be classified into different types based on their functions and characteristics. Common types include tap roots, fibrous roots, aerial roots, and assimilatory roots.

3. **Focus on Assimilatory Roots**: In the case of Trapa, the roots that are specifically mentioned are called "assimilatory roots." These roots are unique because they are capable of photosynthesis.

...