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In contrast to Annelids the Platyhelminths show
A
Absence of body cavity
B
Presence of pseudocoel
C
Radial symmetry
D
Bilateral symmetry
Detailed Solution
Platyhelminthes (flatworms) are acoelomates: there is no body cavity between the body wall and the gut; the space is filled with mesenchyme (parenchyma).
Annelids are true coelomates, with a coelom lined by mesoderm.
So in contrast to annelids, the platyhelminths show the absence of a body cavity.
A pseudocoelom is found in Aschelminthes (roundworms), not in flatworms.
Both flatworms and annelids are bilaterally symmetrical, so bilateral symmetry is not a contrast; neither of them is radially symmetrical.
So the correct answer is the absence of body cavity.
Annelids are true coelomates, with a coelom lined by mesoderm.
So in contrast to annelids, the platyhelminths show the absence of a body cavity.
A pseudocoelom is found in Aschelminthes (roundworms), not in flatworms.
Both flatworms and annelids are bilaterally symmetrical, so bilateral symmetry is not a contrast; neither of them is radially symmetrical.
So the correct answer is the absence of body cavity.