Open ciruclartory system is not of physiological hindrance in Cockroach because

Options

A. Heart is simple but chambered
B. Blood is colourless
C. Circulatory and respiratory system are not connected
D. Excretion occurs through malpighian tubules.

Answer

### Step-by-Step Solution:

1. **Understanding the Open Circulatory System**:
- An open circulatory system is one where the blood (or hemolymph) is not confined exclusively to blood vessels. Instead, it flows freely within the body cavity, allowing nutrients and wastes to move freely among the organs and tissues.

2. **Characteristics of the Cockroach's Circulatory System**:
- In cockroaches, the circulatory system is open, meaning that hemolymph circulates freely in the hemocoel (body cavity) and is not contained within a network of blood vessels.

3. **Connection to the Respiratory System**:
- A key point about the cockroach's physiology is that its circulatory system is not directly connected to its respiratory system. This separation is crucial because it allows both systems to function independently.

4. **Role of Spiracles in Respiration**:
- Cockroaches respire through specialized structures called spiracles. These are openings located on the sides of their bodies that allow air to enter directly into the tracheal system, where gas exchange occurs.

5. **Conclusion**:
- Since the circulatory and respiratory systems operate independently in cockroaches, the open circulatory system does not hinder physiological processes. The cockroach can effectively transport nutrients and waste without interference from its respiratory functions.

### Final Answer:
The open circulatory system is not a physiological hindrance in cockroaches because their circulatory system is not connected to the respiratory system, allowing them to efficiently respire through spiracles without any interference.