Spiracles of cockroach which are larger and always kept open are

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

Tardigrade Admin · Accepted Answer

In cockroaches, there are ten pairs of spiracles, they have slit-like openings that aid in respiration. The first two pairs are known as thoracic spiracles lying in thorax and the remaining eight pairs are called abdominal spiracles and are present in the first eight abdominal segments. The first thoracic and first abdominal spiracles remains open all the time whereas the remaining spiracles open during inspiration and close during expiration.

Q. Spiracles of cockroach which are larger and always kept open are

first and second pairs

first and third pairs

first and tenth pairs

second and third pairs