Which one of the following is correct with regards to animals with bilateral symmetry, triploblastic body and true body cavity?
[amp_mcq option1=”Roundworm, earthworm and leech” option2=”Earthworm, leech and nereis” option3=”Ascaris, round worm and earthworm” option4=”Earthworm, sea cucumber and sea urchin” correct=”option2″]
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UPSC Geoscientist – 2020
Animals that are bilaterally symmetrical and triploblastic are typically found from Platyhelminthes onwards. A true coelom (body cavity lined by mesoderm) is present in annelids, molluscs, arthropods, echinoderms (larvae, adults secondarily radial), and chordates. Earthworms, leeches, and nereis are all annelids. Annelids are characterized by bilateral symmetry, a triploblastic body plan, and a true coelom (eucoelomate).