(a)Annelids have several receptors to sense their light. Light receptors occurs in clusters in polychaetes and leeches to sense light.
(b)In earthworms, they are diffused, which can differentiate only between darkness and light.
(c)Chemical and taste receptors are found in the fleshy lobe called prostomium.
(d)Touch receptors are found all over the body.
(e)They also have balancing organs called statocysts.