What is correct about the anal cerci in a cockroach?

Options

A. Emerge out from the 10th segment in both the sexes.
B. Found in male cockroaches only.
C. These are short thread like structures
D. These are used for the purpose of reproduction.

Answer

To determine the correct statement about the anal cerci in a cockroach, let's analyze the information step by step:

### Step 1: Understanding the Structure
- The anal cerci are a pair of appendages located at the end of the abdomen of a cockroach.
- They arise from the 10th segment of the cockroach's body.

**Hint:** Remember that the anal cerci are located at the posterior end of the cockroach and originate from a specific body segment.

### Step 2: Presence in Both Sexes
- Anal cerci are present in both male and female cockroaches, not just in males.

**Hint:** Consider the biological significance of structures in both sexes when evaluating their presence.

### Step 3: Shape and Structure
- The anal cerci are not short thread-like structures; instead, they are pincer-shaped and multi-segmented.

**Hint:** Visualize the shape of the anal cerci to differentiate them from other appendages.

### Step 4: Function of Anal Cerci
- The primary function of anal cerci is not for reproduction; they serve as sense organs that are sensitive to wind and vibrations.

**Hint:** Think about how sensory organs contribute to an organism's interaction with its environment.

### Conclusion
Based on the analysis, the correct statement about the anal cerci in a cockroach is that they emerge from the 10th segment in both sexes.

**Final Answer:** The correct option is: "Emerge out from the 10th segment in both the sexes."