Which of the following statements is incorrect ?

Options

A. Mesoglea is present in between ectoderm and endoderm in Obelia
B. Asterias exhibits radial symmetry
C. Fasciola is a pseudecoclomate animal
D. Taenia is a triploblastic animal

Answer

To determine which of the following statements is incorrect, we will analyze each statement one by one:

1. **Misoglia is present between ectoderm and ectoderm.**
- Misoglia, also known as mesoglea, is a gelatinous substance found in certain animals, particularly in the phylum Cnidaria. It is located between the ectoderm and endoderm layers. Therefore, this statement is **correct**.

2. **Echinoderms exhibit radial symmetry.**
- Echinoderms, such as starfish and sea urchins, are known for their radial symmetry, especially as adults. This means their body can be divided into similar halves around a central axis. Thus, this statement is also **correct**.

3. **Fasciola is a pseudo-coelomate animal.**
- Fasciola, commonly known as liver fluke, belongs to the phylum Platyhelminthes (flatworms). Flatworms are acoelomate, meaning they lack a true body cavity (coelom). Pseudo-coelomates have a false body cavity, but since Fasciola does not have any body cavity, this statement is **incorrect**.

4. **Tenia is a triploblastic animal.**
- Tenia, or tapeworms, are indeed triploblastic animals, meaning they have three germ layers: ectoderm, mesoderm, and endoderm. This statement is **correct**.

After analyzing all the statements, we conclude that the **incorrect statement** is: **Fasciola is a pseudo-coelomate animal.**

### Summary of the Solution:
- Statement 1: Correct (Misoglia is between ectoderm and endoderm)
- Statement 2: Correct (Echinoderms exhibit radial symmetry)
- Statement 3: Incorrect (Fasciola is acoelomate, not pseudo-coelomate)
- Statement 4: Correct (Tenia is triploblastic)

### Final Answer:
The incorrect statement is: **Fasciola is a pseudo-coelomate animal.**