EVERYDAY SCIENCE

Detailed explanation-1: -Complete answer: Chitinous setae can be found in Annelids and arthropods. Annelids have stiff setae which are bristles like projections present on the body. They help organisms to attach to the surface, thereby preventing backsliding during peristaltic movement.

Detailed explanation-2: -Bristles, called setae, are located on each segment of the earthworm’s body. They prevent the earthworm from slipping backwards.

Detailed explanation-3: -All annelids except the leeches have chitinous hair-like structures, called setae that project out from their cuticle. The setae can also be located on paddle-like appendages which are called parapodia.

Detailed explanation-4: -Earthworms have setae which are S-shaped. These setae are found in rows on the body of an earthworm. These are found in the middle position of each segment. Setae are found in every segment except first, last and clitellum.

Detailed explanation-5: -Setae are commonly used by insects as a substrate of high surface area from which a pheromone is dispersed by evaporation. Adult males of some nemopterid (Neuroptera) genera use distinctive tufts of fine setae (bulla) on the hind margins of the fore-or hind wings to disperse pheromone.