Alimentary canal is absent in

Taenia and Schistosoma

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Ascaris and Fasciola

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Taenia and Echinococcus

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Tricuris and Fasciola

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Solution

The correct option is C Taenia and Echinococcus
The alimentary canal is absent in Taenia and the mode of nutrition is saprozoic. Digested food is absorbed directly from the host intestine through its general body surface. Echinococcus does not have the alimentary canal and they absorbs the nutrients from the host intestine. So, the correct answer is 'Taenia and Echinococcus'.

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