Question

Self-fertilization is found in
(A) Planaria
(B) Taenia
(C) Fasciola
(D) Both A and B

Answer 1

Hint: Self-fertilization is found in an insect or worm which comes under the genus of tapeworm and is a type of helminth. Members of this genus are responsible for diseases like Cysticercosis and Taeniasis in humans.

Complete step by step answer:
Self-fertilization is found in Taenia. The protandrous condition is that
the condition, during which the male reproductive organs mature first, occurs within the younger, immature proglottids. From the neck region after the growth of newer proglottids, the protandrous proglottids mature and move to the center region of the tapeworm. The mature proglottids contain both male and feminine reproductive organs side by side. The mature proglottids can then perform self-fertilization or cross-fertilize with other mature proglottids, depending on the situation.
So, the correct answer is ‘Taenia’.

Additional Information: Taenia is usually characterized by its structure i.e ribbon-like body composed of a series of segments called proglottids. The scolex is the anterior end of the body. It was seen that not all the members of the genus Taenia have an armed scolex which is the hooks or spines located within the "head" region, some are unarmed too, as an example, Taenia saginata has an unarmed scolex, but the Taenia solium has an armed scolex.
Proglottids have a central ovary, with a vitellarium (yolk gland) posterior to that. As altogether cyclophyllidean cestodes, a genital pore occurs on the side of the proglottid. Eggs are released when the proglottid deteriorates, so a uterine pore is senseless.

Note: Have you ever wondered where Taenia gets its name? The Taenia got its name on the basis of its morphological structure. In Greek, tainia means the ribbon-like, bandage, or having stripes on the body. They are generally called intestinal worms.