Question

Choose the mismatched pair regarding cockroach.

• A. Alary muscles -- Blood circulation
• B. Malpighian tubules -- Excretion
• C. Dorso ventral muscles -- Respiration
• D. Anal styles -- Female

Hint:

Sexual characters of cockroach: \[ \boxed{ \begin{aligned} &\text{Male} &&\rightarrow \text{Anal styles present} &\text{Female} &&\rightarrow \text{Anal styles absent} \end{aligned} } \]

Answer 1

The Correct Option is D

Step 1: Examine each pair. \[ \begin{aligned} \text{Alary muscles} &\rightarrow \text{Help in blood circulation} \quad \checkmark \text{Malpighian tubules} &\rightarrow \text{Excretion} \quad \checkmark \text{Dorso ventral muscles} &\rightarrow \text{Aid in respiration} \quad \checkmark \text{Anal styles} &\rightarrow \text{Present only in males} \quad \times \end{aligned} \]

Step 2: Identify the mismatched pair. Anal styles are a pair of short, thread-like appendages found on the $9^{\text{th}}$ sternum of the \[ \boxed{\text{Male cockroach only}.} \] Therefore, "Anal styles -- Female" is incorrect.

Step 3: Choose the correct option. Hence, \[ \boxed{(D)} \] is the correct answer.