13 chambered heart is present in :

Options

A. Earthworm
B. Cockroach
C. Rat
D. Leech

Answer

To determine which organism has a 13-chambered heart, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which organism possesses a 13-chambered heart.

2. **Identify the Organisms**: The options provided include a cockroach, rat, and leech. We need to analyze each of these organisms to find out which one has a 13-chambered heart.

3. **Research the Cockroach**:
- The heart of a cockroach is elongated and located on the mid-dorsal axis of its body.
- It consists of 13 funnel-shaped chambers.
- The heart operates in an open circulatory system, meaning there are no blood vessels.

4. **Research the Rat**:
- Rats are mammals and possess a 4-chambered heart. This type of heart is more complex and is suited for the high metabolic demands of mammals.

5. **Research the Leech**:
- Leeches have a simpler circulatory system and do not possess a 13-chambered heart. They typically have a more primitive heart structure.

6. **Conclusion**: Based on the information gathered, the organism that has a 13-chambered heart is the cockroach.

### Final Answer:
The 13-chambered heart is present in the **cockroach**.

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