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Which one of the following statements about certain given animals is correct?
A
Flat worms (Platyhelminthes) are coelomates
B
Round worms (Aschelminthes) are pseudocoelomates
C
Molluscs are acoelomates
D
Insects are pseudocoelomates
Detailed Solution
In round worms (Aschelminthes) the body cavity is not lined by mesoderm; the mesoderm is present as scattered pouches between the ectoderm and endoderm. Such a cavity is a pseudocoelom, so round worms are pseudocoelomates. This statement is correct.
Flat worms (Platyhelminthes) have no body cavity at all; they are acoelomates.
Molluscs have a true coelom lined by mesoderm; they are coelomates.
Insects (arthropods) are also true coelomates.
Hence the correct statement is that round worms are pseudocoelomates.
Flat worms (Platyhelminthes) have no body cavity at all; they are acoelomates.
Molluscs have a true coelom lined by mesoderm; they are coelomates.
Insects (arthropods) are also true coelomates.
Hence the correct statement is that round worms are pseudocoelomates.