Question

In the cockroach, 0xygen is carried to tissue by
A.Haemoglobin and haemocyanin
B.Blood plasma
C.Tracheal tubes
D.Diffusion through integument

Answer 1

Hint:Cockroaches are black or brown bodied animals which belong to the class Insecta and phylum of Arthropoda. They have a very long antenna; they have a flat extension of the upper body wall which has head and legs. These are pests because they contaminate and destroy food with their smelly excreta and they also transmit various types of diseases.

Complete answer:Cockroach’s respiration occurs through spiracles which are the small openings that are situated on the sides of the body. When the air enters through the external openings, it enters the respiratory system, these spiracles act as the valve which paves the way to the internal respiratory system. The organs of respiration in cockroaches are referred to as tracheae.
This trachea is a dense array of networks which is made up of several air tubes that are found in the internal system. Tracheae are known to balance the pressure inside the system. When the oxygen-rich air goes into the body of a cockroach through spiracles it then enters the tracheal tubes and then diffuses to various tissues and the body cells.
Oxygen is used up to liberate energy. Carbon dioxide-rich air passes into the trachea and then moves out of the spiracles.
Hence the correct answer is option C, Tracheal tubes.

Note:The cockroach circulatory system is of an open type as the hemolymph or the blood flows freely with the cavity of the cockroach body called a hemocoel. There are no capillaries and veins but they have a heart and aorta. The blood of the cockroach is called hemolymph. The blood of the cockroach is not red because it does not use hemoglobin to carry oxygen. As their bloodstream is not meant to carry oxygen. They use a specialized structural pipe called tracheae which bring the oxygen and remove the carbon dioxide out of their tissues.