Heart of cockroach is :

Options

A. Four chamberd
B. Vertral to gut
C. Longitudinal and beaded
D. Three chambered

Answer

### Step-by-Step Solution:

1. **Understand the Structure of Cockroach Heart**: The heart of a cockroach is a specialized organ that plays a crucial role in its circulatory system. It is important to note that the heart is not like that of mammals.

2. **Identify the Number of Chambers**: The heart of a cockroach is known to have 13 chambers. This is a key characteristic that distinguishes it from the hearts of other animals.

3. **Determine the Orientation**: The heart of the cockroach is located ventrally (on the belly side) relative to the gut. However, it is also described as being longitudinal, meaning it runs along the length of the body.

4. **Examine the Heart's Characteristics**: The cockroach heart is described as muscular and beaded. This refers to the thick muscular walls of the heart and the appearance of the chambers which can look like beads.

5. **Evaluate the Options**:
- **4-chambered**: Incorrect, as the cockroach heart has 13 chambers.
- **Ventral to gut**: Incorrect, while it is ventral, the heart is primarily described as longitudinal.
- **Longitudinal and beaded**: Correct, as it accurately describes the heart's structure.
- **3-chambered**: Incorrect, as the heart has 13 chambers.

6. **Conclusion**: Based on the analysis, the correct answer is that the heart of the cockroach is "longitudinal and beaded".

### Final Answer:
The heart of the cockroach is longitudinal and beaded.

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