Which reference to external features of Cockroach, which among the following statements is not correct?

Options

A. It has pulvillus between claws
B. Hind wings are protective and are not useful in flight
C. Fore wings are elytra
D. Gonapophyses help in copulation

Answer

To determine which statement regarding the external features of the cockroach is not correct, let's analyze each statement step by step.

### Step 1: Analyze the First Statement
**Statement:** "It has pulvilli between the claws."

- **Explanation:** The cockroach has a structure called the plantily located on the pre-tarsus. Between the two claws on the underside of the tarsal segment, there is a thin hairy pad known as the pulvillus or aerolium.
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** "Hind wings are protective and they are not useful in flight."

- **Explanation:** The hind wings of a cockroach, also known as metathoracic wings, are thin, membranous, and primarily used for flight. They are not protective; instead, the forewings (mesothoracic wings) serve that purpose.
- **Conclusion:** This statement is **incorrect**.

### Step 3: Analyze the Third Statement
**Statement:** "Forewings are elytra."

- **Explanation:** The forewings of a cockroach are indeed called elytra or tegmina. They are dark, stiff, opaque, and leathery, providing protection to the hind wings.
- **Conclusion:** This statement is **correct**.

### Step 4: Analyze the Fourth Statement
**Statement:** "Gonapophysis helps in copulation."

- **Explanation:** Gonapophysis is an organ in the annular region of the insect that aids in copulation, oviposition, and stinging. It consists of three parts and is present in both sexes.
- **Conclusion:** This statement is **correct**.

### Final Conclusion
Among the statements analyzed, the one that is not correct is the second statement: "Hind wings are protective and they are not useful in flight."

### Summary of the Correct Answer
- The **incorrect statement** is: "Hind wings are protective and they are not useful in flight."