EVERYDAY SCIENCE

Detailed explanation-1: -Proglottids are the segments of the tapeworm that contain the reproductive organs, both male and female. The new proglottids are formed from near the scolex or head region. The older ones called the gravid proglottids which are shed by the process called apolysis.

Detailed explanation-2: -The adult tapeworm is made up of many small segments, called proglottids, each about the size of a grain of rice. Adult tapeworms may measure 4-28 inches in length. As the tapeworm matures inside the intestine, these segments (proglottids) break off and pass into the stool.

Detailed explanation-3: -The head of tapeworms, scolex, contains structures, such as grooves, suckers or hooks, which enable the worm to attach to the gut wall. The major part of the tapeworm is called strobila and it consists of segments, proglottids. They each contain both male and female reproductive organs.

Detailed explanation-4: -Shedding of gravid proglottids is termed apolysis and the tapeworm exhibiting this phenomenon are called apolytic, So, the correct answer is option A.

Detailed explanation-5: -The scolex contains organs which facilitate attachment to the host tissue. Examples of this include suckers or hooks. The neck contains germinal cells which can give rise to new proglottids. Proglottids are individual segments of the strobilus and contain reproductive organs of both sexes.