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Standard XII
Biology
Question
Tube-within-a-tube body plan is shown by:
Coelenterates
Platyhelminthes
Aschelminthes
Porifera
A
Porifera
B
Coelenterates
C
Aschelminthes
D
Platyhelminthes
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Solution
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The animals in the phylum Aschelminthes have a false body cavity also called pseudocoelom.
These animals possess a digestive canal with two openings at the end, i.e. mouth at the anterior end and anus at the posterior end.
A digestive canal is present in the body cavity and hence, it is called a 'tube within a tube' body plan.
Poriferans show cell aggregate plan while Coelenterates and Platyhelminthes show a blind sac body plan.
So, the correct option is C.
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