Question

Spiracles of cockroach which are larger and always kept open are

• A. First and second pairs
• B. First and third pairs
• C. First and tenth pairs
• D. Second and third pairs

Answer 1

Answer: (B)

First and third pairs

Spiracles are openings on the surface of cockroach (and some other animals), which usually lead to respiratory systems. In cockroach, the tracheal system opens to the outside by ten pairs of spiracles. The first and the third pair of spiracle remains open at all times.
Therefore, the correct answer is option B.