Question

Number of spiracles found in Cockroach are

• A. 5 thoracic, 3 abdominal
• B. 3 thoracic, 5 abdominal
• C. 8 thoracic, 2 abdominal
• D. 2 thoracic, 8 abdominal

Answer 1

The correct option is D 2 thoracic, 8 abdominal

In cockroach, the respiratory system has a network of the trachea. They open through 10 pairs of spiracles that are present on the lateral side of the body. Thin tubes carry oxygen from the air to all the parts of the body. The spiracles are regulated by the sphincters. Exchange of gases takes place by diffusion.

These are organized as 2 pairs of thoracic spiracles and 8 pairs of abdominal spiracles.

So the correct answer is '2 thoracic, 8 abdominal'.