EVERYDAY SCIENCE

Detailed explanation-1: -Cockroaches do, in fact, contain blood. Haemolymph, which is found in the hemocoel, is their blood. Their circulatory system is open, with visceral organs bathing in a blood-filled open chamber termed a hemocoel. Haemocytes and colorless plasma make up the hemolymph, which is colorless.

Detailed explanation-2: -The circulatory system in cockroaches is open type. The colour of the blood of the cockroach is not red it is colourless due to the absence of hemoglobin. The blood of the cockroach is known as hemolymph.

Detailed explanation-3: -It flows freely inside the body, touching all the internal organs and tissues. About 90% of this blood is watery fluid and the remaining 10% is made up of hemocytes. Therefore the haemolymph of cockroach is composed of colourless plasma and numerous types of haemocytes.

Detailed explanation-4: -The explanation for the correct option: Cockroaches’ blood (hemolymph) is colorless as they do not have any respiratory pigment in their blood. Plasma and multiple blood corpuscles make up hemolymph (hemocytes).

Detailed explanation-5: -Electron-mictoscopic observations of the blood cells (Haemocytes) in the legs of the cockroach Blaberus discoidalis reveal three ‘types’ of cells distinguishable on the basis of fine structure. One type of cell contains numerous membrane-limited opaque bodies which may be lysosomes.