Select the incorrect statement.

Options

A. In each segment, the exoskeleton has hardended plates called sclerites, sternites dorsally and tergites ventrally
B. The entire body is covered by a hard chitinous exoskeleton (brown in colour).
C. Head is triangular in shape and lies anteriorly at right angles to the longitudinal body axis.
D. A pair of thread - like antennae arise from membranous sockets lying in front of eyes.

Answer

To solve the question of selecting the incorrect statement regarding the exoskeleton of a cockroach, we will analyze each provided statement step by step.

### Step-by-Step Solution:

1. **Analyzing Statement 1**:
- The statement claims that in each segment, the exoskeleton has hardened plates called sclerites, strainites, dorsalis, and terzites.
- **Correct Information**: The correct terminology includes "sclerites" for the hardened plates. However, "strainites" and "terzites" are not standard terms used in this context. The correct terms are "sternites" (ventral) and "tergites" (dorsal).
- **Conclusion**: This statement is incorrect.

2. **Analyzing Statement 2**:
- The statement mentions that the entire body is covered by a hard chitinous exoskeleton, which is brown in color.
- **Correct Information**: This is a true statement as cockroaches do have a hard chitinous exoskeleton that is typically brown.
- **Conclusion**: This statement is correct.

3. **Analyzing Statement 3**:
- The statement describes the head as triangular in shape and lying entirely at a right angle to the longitudinal body axis.
- **Correct Information**: This is also true; the head of a cockroach is indeed triangular and positioned at a right angle to the body.
- **Conclusion**: This statement is correct.

4. **Analyzing Statement 4**:
- The statement states that a pair of thread-like antennae arise from membranous sockets located in front of the eyes.
- **Correct Information**: This is accurate as cockroaches have a pair of long antennae that emerge from the sockets in front of their eyes.
- **Conclusion**: This statement is correct.

### Final Conclusion:
Based on the analysis, the incorrect statement is **Statement 1**.