Which of the following statements is not correct regarding circulation of cockroaches ?

Options

A. Blood vascular system in open type.
B. Blood vascular are poorly developed.
C. Blood vascular open into haemocoel.
D. Visceral organs do not bath in haemolymph.

Answer

To determine which statement is not correct regarding the circulation of cockroaches, we can analyze the characteristics of their circulatory system step by step.

### Step-by-Step Solution:

1. **Understanding the Circulatory System of Cockroaches**:
- Cockroaches have an open circulatory system. This means that their blood (hemolymph) is not confined entirely to blood vessels but is instead allowed to flow freely in body cavities.

2. **Characteristics of the Open Circulatory System**:
- In an open circulatory system, blood vessels are poorly developed. This is a key feature of cockroaches, as their blood vessels do not form a closed loop like those in vertebrates.

3. **Hemocele**:
- The space where the blood flows is called the hemocoel (or hemocele). This cavity is filled with hemolymph, which is the fluid that serves the function of blood in cockroaches.

4. **Visceral Organs**:
- The visceral organs of cockroaches are located within the hemocoel. They are bathed in hemolymph, which provides them with nutrients and oxygen.

5. **Analyzing the Statements**:
- **Statement 1**: The blood vascular system is open type. (Correct)
- **Statement 2**: Blood vessels are poorly developed. (Correct)
- **Statement 3**: Blood vessels open into the hemocoel. (Correct)
- **Statement 4**: The visceral organs do not bathe in the hemolymph. (Incorrect)

6. **Conclusion**:
- The statement that is not correct is that the visceral organs do not bathe in the hemolymph. In fact, they do bathe in hemolymph as they are located in the hemocoel.

### Final Answer:
The statement that is not correct regarding the circulation of cockroaches is: **"The visceral organs do not bathe in the hemolymph."**

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