The heart is ......... chambered in Periplaneta

Options

A. 4
B. 9
C. 11
D. 13

Answer

To answer the question, "The heart is ......... chambered in Periplaneta," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: Recognize that Periplaneta refers to the cockroach, specifically Periplaneta americana.

2. **Understand the Heart Structure**: Research the anatomical structure of the cockroach's heart. The heart of a cockroach is known to be tubular.

3. **Count the Chambers**: Determine the number of chambers in the cockroach's heart. It is known that the heart of a cockroach has 13 chambers.

4. **Location of the Heart**: Note that the heart is located on the dorsal side of the cockroach's body.

5. **Blood Flow Mechanism**: Understand that the heart chambers receive blood through openings called ostia, which allow the blood to enter the chambers.

6. **Conclusion**: Based on the information gathered, we conclude that the heart of Periplaneta (cockroach) is 13 chambered.

### Final Answer:
The heart is **13 chambered** in Periplaneta.

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