OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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echinoderms have bilateral symmetry like arthropods
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unlike arthropods, most echinoderms have radial symmetry
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body parts of echinoderms typically occur in 5 parts
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echinoderms are only bilaterally symmetrical in their larval stage
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Detailed explanation-1: -Echinoderms have spiny skin. Unio is a mollusc. So, the correct answer is option D.
Detailed explanation-2: -Echinoderms have a spiny endoskeleton. They have radial symmetry as adults but bilateral symmetry as larvae. Echinoderms have a unique water vascular system with tube feet. This allows slow but powerful movement.
Detailed explanation-3: -The echinoderms have a radially arranged, pentamerous body structure that is very different from the bilateral body structure of the related deuterostome phyla, the hemichordates and the chordates.
Detailed explanation-4: -Echinoderms are slow animals radically different from us, but they are an evolutionary success. All echinoderms have five-part symmetry. We see the inner workings of sea stars, from their tube feet to their skeleton. Urchins are ferocious herbivores chomping down kelp with their jaws.