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Organisms belonging to phylum mollusca have a rasping organ fcalled radula for feeding..
What does RASPING mean?

Radula is a file-like organ,with hundreds of teeth present in it, similar to a sandpaper.It is used for scraping or cutting food or scraping off algae from surfaces.This can be called rasping mode of nutrition. 
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A flexible tonguelike organ in certain molluscs, having rows of horny teeth on the surface is called radula.
It is a file-like rasping organ. Literally, rasping means harsh-sounding and unpleasant or grating.
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