Question

Blood does not transport ${O_2}$ in
A. Man
B. Frog
C. Cockroach.
D. Pheretima.

Answer 1

Blood is a bodily fluid found in all humans and other animals that transfers metabolic waste products away from cells while delivering vital components such as oxygen and nutrition to the cells. Blood has numerous cells and proteins suspended in it which makes the blood thicker than pure water. There is about $5$ liters of blood in the body of an average person.

Complete answer:
Man: The main function of blood in a human body is to absorb oxygen from air in the lungs and remove waste carbon dioxide from the cells. It also plays an important role in transporting hormones and digested nutrients. Blood is a fluid connective tissue. It can regulate body temperature. Blood does transport oxygen in man.
Hence option A is not correct.
Frog: Amphibians such as frogs contain a DNA-bearing nucleus which is visible at the center of the cell unlike the typical mammalian red blood cells. In frogs, red blood cells are comparatively larger but carry less amounts of oxygen than humans.
Since blood carries oxygen, option B is also not correct.
Cockroach: Cockroaches do not use hemoglobin to carry oxygen, hence they do not have red blood. Their blood stream does not carry oxygen either. Hence a cockroach has colorless blood. The hemolymph is colorless in cockroaches, which is analogues to blood. Colorless blood is mainly found in male cockroaches, while the female cockroaches may have orange color in their blood.
Hence option C is the correct answer.
Pheretima : Pheretima is a genus of earthworm which lives in burrows made in moist soil. Pheretima also has red blood due to the presence of hemoglobin as it is present in higher animals but it is dissolved in plasma and not confined to special corpuscles like erythrocytes. It also functions in transporting oxygen and minerals throughout the body. Hence option D is not correct.

So, Option C. Cockroach is the correct answer.

Note:
Cockroaches have specialized respiration organs known as tracheae which helps them to breathe and transfer oxygen through a system of tubes in their bodies. This system of tubes is similar to the human circulatory system, but air travels through this tube instead of blood travelling through the tubes. The blood of cockroaches is actually distributed throughout their entire body.