2. Answer the following
(ii) How many types of nephridia are found in earthworm based on their location?
On the basis of location, nephridia can be of three types i.e. septal nephridia, integumentary nephridia and pharyngeal nephridia.
1. Septal nephridia: These nephridia are found to be present on both sides of the intersegmental septa behind the 15th segment. They open into the intestines.
2. Integumentary nephridia: These nephridia lie attached to the body wall from the third segment to the last segment, which opens on the body surface.
3. Pharyngeal nephridia: These nephridia are found to be present in the fourth, and fifth. and sixth segments.