Which one of the following is incorrect ?

Options

A. Mesoglea is present in between ectoderm and endoderm in obelia.
B. Radial symmetry is fond in Asterias
C. Fasciola is a pseudocoelomate animal
D. Taenia is triploblastic animal

Answer

To determine which statement is incorrect, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Examine the First Statement:**
- The first statement claims that "mesoglia is present between ectoderm and endoderm."
- This statement is **incorrect** because mesoglia is actually a jelly-like non-living substance found between the ectoderm and endoderm in organisms like cnidarians and sponges, not specifically in obelia.

2. **Examine the Second Statement:**
- The second statement states that "radial symmetry is found in Cnidarians."
- This statement is **correct**. Cnidarians, such as jellyfish and sea anemones, exhibit radial symmetry, where the body can be divided into similar halves around a central axis.

3. **Examine the Third Statement:**
- The third statement mentions that "Acoelomates are pseudocoelomate animals."
- This statement is **incorrect**. Acoelomates are animals that lack a body cavity, while pseudocoelomates do have a false body cavity. Therefore, this statement is misleading.

4. **Examine the Fourth Statement:**
- The fourth statement claims that "Tinea is a triploblastic animal."
- This statement is **correct**. Tinea (tapeworm) has three germ layers: ectoderm, mesoderm, and endoderm, which makes it a triploblastic organism.

### Conclusion:
- The first statement about mesoglia is incorrect. Therefore, the answer to the question is that the first option is the incorrect statement.