Question

In cockroaches, respiration takes place through
A)Skin
B)Trachea
C)Lungs
D)Gills

Answer 1

Gas exchange in insects occurs through an air-filled inner tube system, the tracheal system, the thinner branches of which spread to all areas of the body and can become functionally intracellular in muscle fibers. Oxygen is then delivered directly to its utilization sites during the gas process.

Complete answer:
In the cockroach, the process of breathing takes place by means of the spiracles which are narrow openings present on the lateral sides of the body and are 10 pairs in number. When air reaches the respiratory system through external openings, the spirals act as muscular valves, paving the way to the inner respiratory system. The respiratory organ of the cockroach is called tracheae. The cockroach breathing takes place in the trachea. The tracheal system in the cockroach is a complex network of tubes called trachea, which divides and subdivides into tubes of decreasing diameter. In the end, the trachea branch into microscopic loops, tracheoles.

The trachea is a dense series of air tubes located in the inner system. Tracheae is known to regulate the pressure within the system. When oxygen-rich air enters the body of the cockroach through spirals into the tracheal tubes, it spreads to various tissues and cells of the body.

Hence, the correct answer is option (B)

Note: Cockroach being an insect has an open circulatory system. The animal contains an open form of circulatory system with blood circulating through the blood. The blood of the animal is called hemolymph without a respiratory pigment. Blood in the heart flows unidirectionally from the back to the anterior end of the body.