Which of the following is not correct?

Options

A. sponges haave tissue level of organisation
B. organ level of organisation is founded in platyelminthes
C. in annelids, arthropod, molluscs, echinoderms and chordates organ system level of organisition is found
D. coelenterates, ctenophores and echinoderms have radial symmetry

Answer

**Step-by-Step Solution:**

1. **Identify the Statements**: The question asks to identify which of the following statements is not correct. We have four statements to evaluate.

2. **Evaluate Statement 1**:
- **Statement**: "Sponges have tissue level of organization."
- **Analysis**: Sponges belong to the phylum Porifera. They exhibit a cellular level of organization, not a tissue level. Therefore, this statement is incorrect.

3. **Evaluate Statement 2**:
- **Statement**: "Organ level of organization is found in Platyhelminthes."
- **Analysis**: Platyhelminthes, or flatworms, do indeed have an organ level of organization. They are triploblastic and have organized tissues forming organs. This statement is correct.

4. **Evaluate Statement 3**:
- **Statement**: "Annelids, arthropods, mollusks, echinoderms, and chordates have organ system level of organization."
- **Analysis**: This statement is also correct. All these groups exhibit a higher level of organization where organs work together in systems.

5. **Evaluate Statement 4**:
- **Statement**: "Cnidarians, echinoderms, and chordates have radial symmetry."
- **Analysis**: Cnidarians (like jellyfish) exhibit radial symmetry. However, echinoderms (like starfish) also exhibit radial symmetry, but chordates do not; they exhibit bilateral symmetry. Therefore, this statement is incorrect.

6. **Conclusion**: The statement that is not correct is Statement 1: "Sponges have tissue level of organization."

**Final Answer**: The incorrect statement is: "Sponges have tissue level of organization."

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