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 will analyze each statement based on our understanding of their circulatory system.

### 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 to vessels but flows freely in the body cavity.

2. **Evaluating Each Statement**:
- **Statement 1**: "Blood vascular system is open type."
- This statement is correct. Cockroaches possess an open circulatory system where blood flows directly from the heart to the organs without the presence of veins and arteries.

- **Statement 2**: "Blood vascular are poorly developed."
- This statement is also correct. Since the circulatory system is open, it is simpler and less developed compared to a closed circulatory system found in other organisms.

- **Statement 3**: "The blood vascular system opens into hemocytes."
- This statement is correct as well. Hemolymph in cockroaches bathes the tissues directly, and hemocytes (blood cells) are present in the hemolymph.

- **Statement 4**: "Visceral organs do not bathe in hemolymph."
- This statement is incorrect. In an open circulatory system, visceral organs (such as digestive and excretory organs) are indeed bathed in hemolymph. The blood directly contacts the organs, allowing for nutrient and gas exchange.

3. **Conclusion**:
- The statement that is not correct regarding the circulation of cockroaches is: "Visceral organs do not bathe in hemolymph."

### Final Answer:
The statement that is not correct is: "Visceral organs do not bathe in hemolymph."

---