Which one of the following statements is incorrect?

Options

A. (a) Mesoglea is present in between ectoderm and endoderm in Obelia.
B. (b) Radial symmetry is found in Asterias
C. (c) Fasciola is a pseudocoelomate animal
D. (d) Taenia is a triploblastic animal

Answer

To determine the incorrect statement among the given options, we will analyze each statement one by one.

1. **Statement A**: "Mesoglea is present in between ectoderm and endoderm in Obelia."
- **Analysis**: This statement is true. Obelia is a member of the phylum Cnidaria, and it contains a gelatinous substance called mesoglea that lies between the ectoderm and endoderm layers, providing structural support.

2. **Statement B**: "Radial symmetry is found in starfish."
- **Analysis**: This statement is also true. Starfish (or sea stars) belong to the phylum Echinodermata, and they exhibit radial symmetry as adults. Their larvae, however, show bilateral symmetry, but since the statement refers to adults, it is correct.

3. **Statement C**: "Fasciola is a pseudocoelomate animal."
- **Analysis**: This statement is false. Fasciola, commonly known as the liver fluke, belongs to the phylum Platyhelminthes (flatworms), which are acoelomate animals. Acoelomates do not have a coelom (body cavity), while pseudocoelomates have a body cavity that is not completely lined by mesoderm.

4. **Statement D**: "Tinea is a triploblastic animal."
- **Analysis**: This statement is true. Tinea, commonly known as tapeworm, also belongs to the phylum Platyhelminthes and is indeed triploblastic, meaning it has three germ layers: ectoderm, mesoderm, and endoderm.

After analyzing all statements, we find that the incorrect statement is:

**Correct Answer**: C - "Fasciola is a pseudocoelomate animal."

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