OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Spicules of chitin plates
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Ossicles of chitin plates
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Spicules of calcium carbonate
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Ossicles of calcium carbonate
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Detailed explanation-1: -Calcite was the most common and characteristic of echinoderm ossicles.
Detailed explanation-2: -Stereom is a calcium carbonate material that makes up the internal skeletons found in all echinoderms, both living and fossilized forms.
Detailed explanation-3: -The endoskeleton of echinoderms is composed of plates, known as ossicles, that are formed from networks of calcium carbonate crystals called the stereom.
Detailed explanation-4: -Ossicles are small calcareous elements embedded in the dermis of the body wall of echinoderms. They form part of the endoskeleton and provide rigidity and protection.
Detailed explanation-5: -Echinoderms possess a unique internal skeleton (or endoskeleton) composed of thousands to millions of calcium carbonate components known as ossicles.