Question

Excretory organs of Taenia are
A. Flame cells
B. Solenocytes
C. Protonephridia
D. All of the above

Answer 1

Hint: Taenia is a genus of tapeworms that are found in Latin America, Asia and East Africa. It generally measures more than 80 feet long and can survive as long as 30 years in a host.

Complete answer:
Flame cells are specialized excretory cells found in freshwater invertebrates including flatworms like Taenia. Hence, ‘option A’ is correct.
Solenocytes are flagellated cells found in Platyhelminthes (Taenia) which are meant for excretion and osmoregulation. Hence, ‘option B’ is correct.
Bundles of flame cells are called protonephridia. They are generally found in the basal organisms such as tapeworms (Taenia). Hence, ‘option C’ is correct.

Hence, the correct answer is option (D).

Additional information:
Taenias are some important parasites of livestock. They cause disease like taeniasis and cysticercosis in humans. They come under phylum Platyhelminthes. More than 100 species have been recorded till now. Their body is divided into different segments and has a ribbon-like and hence they are known as Taenia. Taenia in greek means ribbon, bandage or stripe. Not all members of the genus Taenia have an armed scolex at the anterior end of the body. Taenia saginata is such an example. Proglottids have a central ovary, with a vitellarium present posteriorly. As in all cyclophyllidean cestodes, a genital pore occurs on the proglottid side. Eggs are released when the proglottid deteriorates, and thus uterine pore is unnecessary.

Note: Taenia belongs to class Cestoda under phylum Platyhelminthes. Nearly more than 100 species have been found still now. They have many excretory cells on their body such as flame cells and solenocytes. Bundle of flame cells also helps in excretion and osmoregulation.