Question

The colour of haemolymph of cockroach is -
a. Yellow
b. Red
c. Green
d. Colourless

Answer 1

Hint: The blood circulatory organization of cockroach is of open type as the blood or hemolymph flows generously in the body cavity or hemocoel. The heart and aorta are present but capillaries and veins are missing. The cockroach blood is known as hemolymph.

Complete answer:
Cockroach blood is not red because it does not utilize hemoglobin to carry oxygen. Their bloodstream is not used to hold oxygen either. They use an organization of pipes called tracheae to bring oxygen and eliminate carbon dioxide from their tissues. As a result, other aspects decide the blood color. So, the blood of cockroaches does not surround hemoglobin because it has some other ways to carry oxygen directly into the tissues.

Hence, the correct answer is option (D).

Additional information:
> Red blood cells enclose a molecule called hemoglobin, which links and transports oxygen through our bodies. Hemoglobin is composed up of four protein chains that each bind an extra ring-shaped chemical structure called heme. Our red blood cells are red since the heme groups in hemoglobin. Resulting, our blood is red due to the millions of red blood cells that it contains.

> Green blood is one of the strangest characteristics in the animal kingdom, but it's the characteristic of a group of lizards in New Guinea. Prasinohaema is green-blooded skinks or a kind of lizard.

> Yellow blood also presents in animals like sea cucumbers. Due to the high-concentration of vanadium-based pigment, the color of the blood turns yellow.

Note: The fluid that is identical to the blood in vertebrates and circulates in the center of the arthropod body remaining in undeviating contact with the animal's tissues is called hemolymph. Thus, in the cockroach, the hemolymph is colorless. The blood of the cockroach does not carry oxygen and also they don’t have vessels. So the blood of cockroaches can be said to be colorless or white as well.