Question:
Choose the mismatched pair regarding cockroach:
Choose the mismatched pair regarding cockroach:
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Taenidia are spiral chitinous thickenings present in tracheal tubes.
Updated On: Jun 17, 2026
- Spiracles -- taenidia
- Stigmata -- peritremes
- Trachea -- intima
- Ootheca -- colleterial glands
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The Correct Option is A
Solution and Explanation
Concept:
Taenidia are spiral thickenings present in tracheae. They prevent collapse of air tubes.
Step 1: Check Option (A).
Taenidia are associated with tracheae and not spiracles.
Hence this pair is incorrect.
Step 2: Check remaining pairs.
\[ \begin{aligned} \text{Stigmata} &\leftrightarrow \text{Peritremes} \\ \text{Trachea} &\leftrightarrow \text{Intima} \\ \text{Ootheca} &\leftrightarrow \text{Colleterial glands} \end{aligned} \] All are correctly matched.
Step 3: Select answer.
\[ \boxed{\text{Option (A)}} \] is the mismatched pair.
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