Question

In which of the following animal blood is red coloured without RBC?
A. Earthworm
B. Cockroach
C. Frog
D. Dugesia

Answer 1

Red colour of blood is because it comprises a substance known as haemoglobin. Every haemoglobin protein is composed of subunits called hemes. The hemes can attach iron molecules, and these iron molecules attack oxygen. The haemes provide red color to the blood. Haemoglobin is served as vasculature and respiratory pigment. It is incorporated with oxygen to create oxyhemoglobin.

Complete answer:
A unique combination of plasma protein is present in the blood of a few animals. These proteins are responsible for the numerous shades of the blood. The blood of earthworm is red because of the presence of respiratory pigment i.e., haemoglobin, it is not contained in the corpuscles like vertebrates yet is discovered and disintegrated in the plasma. The cockroach is known to have white colour blood. The white or clear blood is developed due to a lack of proteins like haemoglobin and hemocyanin in blood.
The frog is known to have green shading blood. Because of the presence of biliverdin pigment the blood of the frog is green. The common name of Dugesia is Planaria. They have a long body with a narrowly triangle-shaped head. There are no circulatory or respiratory systems and oxygen entering and carbon dioxide leaving the body occurs with the help of the body wall.

So, the correct answer is option A.

Note:
Salamander has the biggest RBC and Musk deer has the littlest RBC. In man, RBC formation occurs within 72 hrs. The shape of the RBC is biconcave. In the RBC of mammals, the nucleus is absent except camel while in vertebrates it is present. The major location for the formation of RBC is bone marrow.