SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Calcium carbonate (CaCO3)
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Silica
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Both are correct
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Neither are correct
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Detailed explanation-1: -Spicules are composed of either Calcium or Silica. Looking at composition is another way to narrow down possible sponge groupings.
Detailed explanation-2: -Accordingly spicules are of two types: Calcareous spicules: The organic material in this type of spicules is calcium carbonate or calcite. This is the characteristic of the sponges of class Calcarea. Siliceous spicules: The organics material in this type of spicules is Colloidal silica or Silicon.
Detailed explanation-3: -Spicules have four major symmetry types: Monaxon (simple cylinders with pointed ends), triaxon, tetraxon, and polyaxon. Sponges can be calcareous, siliceous, or composed of spongin. The meshing of numerous spicules serves as the sponge’s skeleton.
Detailed explanation-4: -Besides supporting sponge cells, spicules can help larvae stay buoyant while in the plankton or reach the bottom at settlement, enhance reproduction success, or catch prey.