Which of the above statement is incorrect ?

Options

A. The body of Platyhelminthes bears suckers and most of them are endoparasites.
B. The sedimentary from of colentrata is polyp.
C. Closed circulatory system respiratory pigment dissolved in plasma and setae are the unique features of annelida.
D. Spiny skin, closed circulatory system and developed sense organs are present in echinodermata .

Answer

To solve the question "Which of the above statements is incorrect?", we will analyze each statement one by one to determine their correctness.

### Step-by-Step Solution:

1. **Analyzing the First Statement**:
- The statement is: "The body of platyhelminths bears suckers and most of them are endoparasites."
- **Explanation**: Platyhelminths, commonly known as flatworms, do indeed have suckers and many species are endoparasites (living inside a host). This statement is **correct**.

2. **Analyzing the Second Statement**:
- The statement is: "The sedentary form of the coelenterata is polyp."
- **Explanation**: Coelenterates (now referred to as Cnidarians) can exist in two forms: polyp and medusa. The polyp is indeed the sedentary form. This statement is also **correct**.

3. **Analyzing the Third Statement**:
- The statement is: "Closed circulatory system, respiratory pigment dissolved in the plasma are unique features of the annelids."
- **Explanation**: Annelids have a closed circulatory system, and their respiratory pigment (hemoglobin) is indeed dissolved in the plasma. This statement is **correct**.

4. **Analyzing the Fourth Statement**:
- The statement is: "Spiny skin, closed circulatory system and developed sensory organs are present in the echinodermata."
- **Explanation**: Echinoderms are characterized by their spiny skin, but they do not have a closed circulatory system; they possess an open circulatory system. Therefore, this statement is **incorrect**.

### Conclusion:
The incorrect statement among the options provided is the fourth statement regarding echinoderms.

### Final Answer:
The incorrect statement is: **"Spiny skin, closed circulatory system and developed sensory organs are present in the echinodermata."**

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