Based on the options provided (Eisenia fetida, Lumbricus rubellus, Caenorhabditis elegans, Platyhelminthes), only Eisenia fetida (Red Wiggler) and Lumbricus rubellus (Red Earthworm) are commonly used earthworm species for vermicomposting. Caenorhabditis elegans is a nematode used in research, and Platyhelminthes are flatworms not used for composting.
(Question text is in Kannada and ignored as per instructions)
Asked in KPSC KAS Prelims 2017 · Topic: Taxonomy (Concepts of Species and Other Taxa)
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