Question

Which one of the following can respire in the total absence of air?
A. Cockroach
B. Leucosolnia
C. Amoeba
D. Taenia solium

Answer 1

Hint: Taenia solium has no free oxygen present in the intestine and respiration is anaerobic they are parasitic

Complete answer: Taenia solium belongs to the cyclophyllid cestode in the family Taeniidae, it is a pork tapeworm.
It is an intestinal zoonotic parasite that is found throughout the world.
They do not have a digestive system, anus, digestive tract, or mouth their respiration is anaerobic. They have a segmented and ribbon-like body structure.
Cockroach, Leucoslnia, and Amoeba cannot respire in the total absence of air.

Additional information: The life cycle of T. solium is generally indirect.
It moves through pigs or other animals, as intermediate hosts, into humans, as definitive hosts.
In humans, the infection can be primarily short or long-lasting, and in the latter case if reaching the brain can last for life.
From humans, the eggs are released in the environment where they await ingestion by a different host.
In the secondary host, the eggs evolve into oncospheres which bore through the intestinal wall and migrate to the next parts of the body where the cysticerci form.
The cysticerci can survive for many years in the animal.

Hence, the correct option is ‘D’

Note: Taenia solium has hooks and suckers which are usually present to help in the attachment to the intestinal wall and then penetrate the intestinal mucosa in the blood vessels. Their segmentation is not true to metamerism as compared to the Annelids. They cause infection in pigs and humans known as Cysticercosis.
Pigs get infected by ingesting embryonated eggs that are present inside the oncospheres.