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| 1. |
Mention the appendages involved in the locomotion of a typical annelid |
| Answer» All\xa0annelids\xa0except leeches also\xa0have\xa0chitonous hair-like structures, called setae, projecting from their cuticle. Sometimes the setae\xa0are\xa0located on paddle-like\xa0appendages\xa0called parapodia.\xa0Annelids are\xa0schizocoelous and with a large and well-developed true coelom (i.e., one that is lined with mesoderm).\xa0The basic features of\xa0locomotion\xa0in\xa0annelids\xa0are most easily observed in the earthworm because it lacks\xa0appendages\xa0and parapodia.\xa0Movement\xa0involves extending the body, anchoring it to a surface with setae, and contracting body muscles. ... The setae are retracted during the circular contraction period. | |