$ Sea Aneomone has parasitic nutrition.
! Roundworms are also called Trematodes.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

To solve the question, we need to analyze the two statements provided:

1. **Assertion**: Sea anemone has parasitic nutrition.
2. **Reason**: Roundworms are also called Trematodes.

### Step-by-Step Solution:

**Step 1: Analyze the Assertion**
- Sea anemones are marine animals that belong to the phylum Cnidaria.
- They are known to be carnivores, meaning they primarily feed on other organisms such as small fish and zooplankton.
- They capture their prey using specialized cells called nematocysts, which contain stinging structures.
- Since sea anemones do not derive their nutrition from living on or in another organism (which would be parasitic nutrition), the assertion that "Sea anemone has parasitic nutrition" is **incorrect**.

**Step 2: Analyze the Reason**
- Roundworms belong to the phylum Nematoda, which is distinct from the phylum Platyhelminthes.
- Trematodes are actually a class of flatworms within the phylum Platyhelminthes, commonly known as flukes.
- Therefore, the statement that "Roundworms are also called Trematodes" is also **incorrect**.

**Step 3: Conclusion**
- Since both the assertion and the reason are incorrect, the correct answer to the question is that **both assertion and reason are wrong**.

### Final Answer:
Both assertion and reason are wrong.