In cockroaches, air enters into the body through which of the given options?

Detailed Solution Explanation:

In cockroaches, air enters the body through spiracles. Spiracles are tiny openings located on the sides of the cockroach's body. These openings are part of the cockroach's respiratory system, which is designed to supply oxygen to its body tissues.

The air enters through spiracles and moves into a network of tubes called the tracheae. These tracheae carry the oxygen directly to the cockroach's cells, bypassing the need for blood to transport oxygen, as in humans. This is an efficient system for insects like cockroaches, allowing them to breathe easily without lungs or gills.

Other options like gills and lungs are incorrect because these are respiratory structures found in aquatic animals and mammals, respectively. Cockroaches are terrestrial insects and do not have lungs or gills. Similarly, they do not rely on their skin for respiration as amphibians do.

Final Answer:

In cockroaches, air enters the body through spiracles. These spiracles act as small airways to bring oxygen directly into their tracheal system.