Which of the following has a neurogenic heart ?

Options

A. Cockroach
B. Octopus
C. Frog
D. Cormorant

Answer

To determine which organism has a neurogenic heart, we need to analyze the options provided based on the characteristics of their circulatory systems.

### Step-by-Step Solution:

1. **Understanding Neurogenic Heart**:
- A neurogenic heart is one that requires nervous input to initiate and regulate its contractions. This means that the heart's rhythmic beating is controlled by nerve impulses.

2. **Analyzing the Options**:
- **Option 1: Cockroach**:
- Cockroaches are arthropods, and they possess a neurogenic heart. Their heart requires nerve impulses to contract, making this option correct.
- **Option 2: Octopus**:
- Octopuses have a different type of heart system. They possess three hearts, but their heart contractions are not primarily controlled by nervous input, so this option is incorrect.
- **Option 3: Frog**:
- Frogs have a three-chambered heart, and their heart contractions are regulated by intrinsic mechanisms rather than being neurogenic. Therefore, this option is also incorrect.
- **Option 4: Cormorant**:
- Cormorants are birds that have a four-chambered heart. Like frogs, their heart contractions are not neurogenic, making this option incorrect as well.

3. **Conclusion**:
- Based on the analysis, the only organism from the options provided that has a neurogenic heart is the **Cockroach**.

### Final Answer:
The organism that has a neurogenic heart is **Cockroach**.