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Which one of the following kinds of animals are triploblastic?
A
Corals
B
Flat worms
C
Sponges
D
Ctenophores
Detailed Solution
Triploblastic animals have three embryonic germ layers: ectoderm, mesoderm and endoderm.
Platyhelminthes (flat worms) to chordates are triploblastic; flat worms are triploblastic, acoelomate and bilaterally symmetrical.
Corals (coelenterates) and ctenophores are diploblastic, with only ectoderm and endoderm separated by mesoglea.
Sponges have a cellular level of organisation without true germ layers or tissues.
Hence flat worms are triploblastic.
Platyhelminthes (flat worms) to chordates are triploblastic; flat worms are triploblastic, acoelomate and bilaterally symmetrical.
Corals (coelenterates) and ctenophores are diploblastic, with only ectoderm and endoderm separated by mesoglea.
Sponges have a cellular level of organisation without true germ layers or tissues.
Hence flat worms are triploblastic.