Question

The blood of Cockroach contains corpuscles known as
a. Hemocytes
b. Plasmocytes
c. Coagulocytes
d. All of the above

Answer 1

Hint: The cockroaches have an open circulatory system. Hemolymph is the circulatory fluid of cockroaches. The hemolymph flows freely to reach every internal organs and tissue inside the body.

Complete answer:
The blood of cockroaches is colorless and is referred to as hemolymph. The hemolymph contains no hemoglobin and instead it is composed of a fluid plasma in which blood cells are suspended. The blood cells are also known as hemocytes or corpuscles. They have mainly two types of hemocytes or corpuscles that are, pro-leukocytes cells and phagocytes cells. The plasma contains various ions and compounds present in them. The types of blood cells present in the hemolymph of cockroaches are hemocytes, pro-leukocytes, plasmocytes, phagocytes, granulocytes and agranulocytes.

So, the blood of cockroaches or hemolymph contains corpuscles or blood cells which are hemocytes, plasmocytes and coagulocytes.

Hence, the correct option will be, (d) All of the above.

Additional Information:
In cockroaches, the circulating fluid or blood does not flow through the vessels. They come in direct contact with the tissues while flowing in the hemocoel. This is the reason why the blood of cockroaches is called hemolymph. The plasma of hemolymph contains various organic compounds, inorganic ions, and many enzymes. The plasma is the major tissue type of the open circulatory which is the characteristic of arthropods. These help in the transporting of various food substances and their storage.
The hemocytes are also present in hemolymph, helping in the formation of new cells and protecting the cells from various pathogens and tissue debris.

Note: The blood of cockroach is known as hemolymph and the most abundant cells in them are hemocytes. Thus, the blood of cockroaches not only contains hemocytes, but they also contain plasmocytes and coagulocytes in them.