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Question
Alimentary canal is absent in:
Alimentary canal is absent in:
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Solution
The correct option is A Taenia and Echinococcus
The canal that extends from mouth to the anus is called the alimentary canal. It performs the function of digestion.
Parasitic organisms feed on the digested food in the host organism.
Taenia and Echinococcus belong to the parasitic class of phylum Platyhelminthes. Thus they absorb the digested food from the host intestine through its general body surface. They do not require an alimentary canal as they are already absorbing the food which is digested. Therefore alimentary canal is absent in Taenia and Echinococcus.
Whereas organisms like Ascaris, Fasciola, Tircuris and Schistosoma have an alimentary canal that helps in the process of digestion.
The canal that extends from mouth to the anus is called the alimentary canal. It performs the function of digestion.
Parasitic organisms feed on the digested food in the host organism.
Taenia and Echinococcus belong to the parasitic class of phylum Platyhelminthes. Thus they absorb the digested food from the host intestine through its general body surface. They do not require an alimentary canal as they are already absorbing the food which is digested. Therefore alimentary canal is absent in Taenia and Echinococcus.
Whereas organisms like Ascaris, Fasciola, Tircuris and Schistosoma have an alimentary canal that helps in the process of digestion.
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