Practice question

Caenorhabditis elegans is small free-living transparent soil nematode about 1 mm long, eutelic with invariant 959 somatic cells in hermaphrodite, extensively used as model organism for development, neurobiology and genetics since Sydney Brenner's work leading to Nobel prizes. Position: Phylum Nematoda, Class Chromadorea, Order Rhabditida. Exhibits typical nematode traits: pseudocoelom as hydroskeleton, complete alimentary canal, collagenous cuticle moulted four times, renette excretory system, simple nervous system with 302 neurons fully mapped. Fully sequenced genome, three-day life cycle, hermaphroditic self-fertilization facilitate laboratory culture and genetic screens worldwide in research laboratories.