Select the correct information about American cockroach (Periplaneta americana) .

Options

A. `{:("Head","Restricted mobility"):}`
B. `{:("Spiracles","12 pairs"):}`
C. `{:(" Malpighian tubules","50-60 in number"):}`
D. `{:("Anal styles ","Sternum of "9^(th) "abdominal segment "):}`

Answer

To solve the question regarding the correct information about the American cockroach (Periplaneta americana), we will analyze the given statements one by one and determine their accuracy.

### Step-by-Step Solution:

1. **Identify the Scientific Classification**:
- The American cockroach is scientifically known as **Periplaneta americana**.
- It belongs to the class **Insecta** within the phylum **Arthropoda**.

**Hint**: Remember the scientific classification hierarchy: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

2. **Evaluate the First Statement**:
- **Statement**: "Head has restricted mobility."
- **Analysis**: This statement is incorrect. The head of the cockroach is connected to a flexible neck, allowing it to move in various directions.

**Hint**: Think about the anatomy of the cockroach and how its head is structured.

3. **Evaluate the Second Statement**:
- **Statement**: "Spiracles with 12 pairs."
- **Analysis**: This statement is also incorrect. The American cockroach has **10 pairs of spiracles**: 2 pairs in the thoracic region and 8 pairs in the abdominal region.

**Hint**: Recall the function of spiracles in respiration and their typical number in insects.

4. **Evaluate the Third Statement**:
- **Statement**: "Malfegian tubules, 50 to 60 in number."
- **Analysis**: This statement is incorrect. The American cockroach actually has **100 to 150 Malpighian tubules**, which are involved in excretion.

**Hint**: Consider the role of Malpighian tubules in the excretory system of insects.

5. **Evaluate the Fourth Statement**:
- **Statement**: "NL style, this is present in the males and it is present on the ninth abdominal segment of the sternum."
- **Analysis**: This statement is correct. The **NL style** (or anal style) is indeed present in male cockroaches and is located on the ninth abdominal segment.

**Hint**: Focus on the reproductive anatomy of male cockroaches and the significance of the NL style.

### Conclusion:
After evaluating all the statements, the only correct information about the American cockroach is the fourth statement regarding the NL style.

**Final Answer**: The correct information about the American cockroach (Periplaneta americana) is that the NL style is present in males on the ninth abdominal segment of the sternum.