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Which of the following is the respiratory pigment of cockroach?
a. Haemozoin
b. Haemocyanin
c. Haemoglobin
d. None of the above

Answer Verified Verified
Hint: In every organism, the need of respiratory pigments is there due to the reason that they help in carrying the required gas element like oxygen or carbon dioxide. They help in carrying the essential gas element and make it to all the different parts of the body. Moreover, it aids the body by converting the deoxygenated blood into the oxygenated blood.
Also, it assists the body to release carbon dioxide back into the atmosphere. However, on the other hand, we know that the oxygen is directly transferred to vessels in most of the insects.

Complete answer:
- We know the blood of Cockroach comprises no red blood cells to pass the element oxygen because it has a respiratory system that is said to be open. Thus, its blood is colorless.

- Hemolymph is the name given to the blood which flows in the insects such as the cockroaches. In general, this blood is colorless since there is an absence of blood cells and respiratory pigment.

- Whereas Hemocyanin can be defined as the protein which carries the gas oxygen in the phylum of arthropods.

- After the completion of the digestion of blood by some of the blood-feeding parasites present in an organism, there is the formation of a product which is called Haemozoin.

- In human beings and animals, there is the presence of pigment hemoglobin which is prone to combine with oxygen and carry it throughout the whole body.

Hence, The correct answer is option (D).

Note: However, it should be noted that organisms like cockroach have Haemocyanin. It is a protein that helps in the transportation of oxygen in some of the invertebrates. Unlike hemoglobin, this protein never combines with oxygen.