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

Options

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

Explanation

To solve the question regarding Periplaneta americana (the scientific name for cockroach), we need to evaluate the given statements one by one and determine which one is correct.

### Step-by-Step Solution:

1. **Understanding the Organism**:
- Periplaneta americana is the scientific name for the common cockroach. It is important to know basic facts about its anatomy and physiology.

2. **Evaluating the First Statement**:
- The first statement claims that the nervous system is located dorsally and consists of segmentally arranged ganglia joined by longitudinal connectives.
- **Analysis**: The nervous system of Periplaneta americana is actually located ventrally (not dorsally). Therefore, this statement is incorrect.

3. **Evaluating the Second Statement**:
- The second statement states that males bear a pair of short thread-like anal styles.
- **Analysis**: This statement is correct. Male cockroaches do have anal styles, which are absent in females. They are found on the 9th sternum of males.

4. **Evaluating the Third Statement**:
- The third statement mentions that there are 16 very long Malpighian tubules present at the junction of the midgut and hindgut.
- **Analysis**: This statement is incorrect because Periplaneta americana actually has between 100 to 150 Malpighian tubules, not 16.

5. **Evaluating the Fourth Statement**:
- The fourth statement claims that grinding of food is carried out only by the mouth parts.
- **Analysis**: This statement is also incorrect. In cockroaches, grinding of food is primarily done by the gizzard, which has folds that aid in grinding, in addition to the mouth parts.

6. **Conclusion**:
- After evaluating all the statements, the only correct statement is the second one: "Males bear a pair of short thread-like anal styles."

### Final Answer:
The correct statement with respect to Periplaneta americana is: **Males bear a pair of short thread-like anal styles.**

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