Select the correct statement from the ones given below with respect to Periplaneta americana

Options

A. Males bear a pair of short thread like anal styles
B. There are 16 very long Malpighian tubules present at the junction of midgut and hindgut
C. Grinding of food is carried out only by the mouth parts
D. Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives

Answer

To solve the question regarding Periplaneta americana (the American cockroach), we need to evaluate the statements provided and determine which one is correct. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Identify the Subject**: The question is about Periplaneta americana, commonly known as the American cockroach.

2. **Evaluate Each Statement**:
- **Statement 1**: "Male deer appear of short thread-like anal styles."
- This statement is **correct**. Male cockroaches do have a pair of thread-like anal styles that are sensitive to touch.

- **Statement 2**: "There are 16 very long Malpighian tubules present at the junction of the midgut and hindgut."
- This statement is **incorrect**. Cockroaches have approximately 100 to 150 Malpighian tubules, not 16.

- **Statement 3**: "Grinding of food is carried out only by the mouth parts."
- This statement is **incorrect**. In cockroaches, food grinding is performed by both the mouthparts and the gizzard.

- **Statement 4**: "Nervous system located dorsally consists of segmentally arranged ganglia joined by a pair of longitudinal connectives."
- This statement is **incorrect**. The nervous system of cockroaches is ventrally located, not dorsally.

3. **Conclusion**: After evaluating all the statements, the only correct statement is the first one regarding the male cockroach's anal styles.

### Final Answer:
The correct statement with respect to Periplaneta americana is: "Male cockroaches bear a pair of thread-like anal styles."