The 'tube-within-a-tube' body plan is not pre | vedclass

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(A) The 'tube-within-a-tube' body plan refers to a complete digestive system with two separate openings,a mouth and an anus. This type of body plan is

Vedclass · Accepted Answer

Taenia

Vedclass · Answer

(A) The 'tube-within-a-tube' body plan refers to a complete digestive system with two separate openings,a mouth and an anus. This type of body plan is characteristic of organisms belonging to the phyla from Aschelminthes to Chordata. $Taenia$ (tapeworm) belongs to the phylum Platyhelminthes,which exhibits a 'blind-sac' body plan,meaning it has only one opening that serves as both mouth and anus,or it lacks a digestive system entirely (as in tapeworms which absorb nutrients directly). $Pheretima$ (earthworm),$Leech$ (Hirudinaria),and $Ascaris$ (roundworm) possess a complete digestive tract,thus exhibiting the 'tube-within-a-tube' body plan.

The 'tube-within-a-tube' body plan is not present in the:

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