Question

The number of hooks present in rostellum of tape are
A. 16
B. 6
C. 32
D. 12

Answer 1

Hint: Tapeworms belong to the phylum of Platyhelminthes. It possesses a body that is flat ribbon-shaped. The protruding part of the anterior end of the body of tapeworms is known as the rostellum which is a globular, spiny structure when to protrude, and a circular hollow pit when retracted.

Complete answer:
The pork tapeworm or Taenia solium is an example of the tapeworm which belongs to the cyclophyllidean cestode family Taeniidae and the phylum of Platyhelminthes. It is seen throughout the world and is most commonly found in those countries where pork is eaten.
The body of a mature worm is flat and ribbon-shaped. The body is white in hue and 2 to 3 meters long in measurement. It has a tiny attachment which is known as the scolex. This scolex contains suckers and a rostellum. These are the organs of attachment that are connected to the wall of the small intestine. The main body is made up of a chain of segments called proglottids.
The rostellum is a protruding organ of the anterior end of tapeworms. This organ is contractible with a cone-like muscular structure and noticed on the apical end of the scolex. In most species, it is armed with hooks. The rostellum is the organ of attachment to the host's intestinal wall.
When it protrudes, the rostellum has a spiny structure and when it retracts, it has a circular hollow pit. The structure of the rostellum is made up of several concentric rows of hooks. The number and arrangement of the hooks differ in different species. In a rostellum of tape, the number of hooks present are 22 to 32.
There are two basic types of hooks found. The hooks present in the upper row are larger and have a projecting, rounded stout guard while the hooks present in the lower row are smaller and have a flattened guard.

Therefore, the correct option for the question is option C.

Note: Tapeworms belong to the family of Taeniidae and the phylum of Platyhelminthes. It possesses a flat and ribbon-shaped body and there is a tiny attachment called scolex. Suckers and a rostellum are the two parts of the scolex. The rostellum is a protruding organ found in the anterior end of tapeworms which is made up of several concentric rows of hooks. The number of hooks present in a rostellum of tape are 22 to 32.