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, we need to analyze each statement provided and determine which one is incorrect. Let's break it down step by step:

### Step 1: Analyze the First Statement
**Statement:** "In each segment, the exoskeleton has hardened plates called sclerites, tergites dorsally, and sternites ventrally."

- **Analysis:**
- The exoskeleton of arthropods, including cockroaches, is indeed made up of hardened plates.
- Tergites are the dorsal plates, while sternites are the ventral plates.
- However, the term "tenides" appears to be a typographical error or a misstatement. The correct term should be "sternites" for the ventral side.

**Conclusion:** This statement is incorrect due to the misuse of the term "tenides."

### Step 2: Analyze the Second Statement
**Statement:** "The entire body is covered by a hard cutaneous exoskeleton, brown in color."

- **Analysis:**
- This statement is true. Cockroaches have a hard exoskeleton that is indeed brown in color.

**Conclusion:** This statement is correct.

### Step 3: Analyze the Third Statement
**Statement:** "The head is triangular in shape and lies interiorly at right angles to the longitudinal body axis."

- **Analysis:**
- This statement is also true. The head of a cockroach is triangular and positioned at right angles to the body axis.

**Conclusion:** This statement is correct.

### Step 4: Analyze the Fourth Statement
**Statement:** "A pair of thread-like antennae arise from membranous sockets lying in front of the eyes."

- **Analysis:**
- This statement is true as well. Cockroaches have long, thread-like antennae that are sensitive and arise from sockets in front of their eyes.

**Conclusion:** This statement is correct.

### Final Conclusion
After analyzing all statements, we find that the first statement is the only incorrect one. Therefore, the answer to the question is:

**Incorrect Statement:** "In each segment, the exoskeleton has hardened plates called sclerites, tergites dorsally, and sternites ventrally."

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