OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -Echinoderms possess five-sided radial symmetry – think five arms of a starfish – but have bilaterally symmetrical larvae. They include both sessile (not moving) and motile representatives.
Detailed explanation-2: -The correct answer is (b). Echinoderms do not have gills.
Detailed explanation-3: -Sessile Echinoderms: Classes Crinoidea & Blastoidea. The sessile (immobile) classes are the crinoids (sea lilies) and the blastoids. Of these, only crinoids still live today.
Detailed explanation-4: -Together, these animals make up the Echinodermata, a word with Greek origins meaning “hedgehog skin.” Echinoderms live in every ocean, even off the coast of Antarctica. Well known as coastal dwellers, they can be found at depths over three miles deep (5, 000 meters).