Answer the following:
(i) What is the function of nephridia?
(ii) How many types of nephridia are found in earthworm
based on their location?
(i) Nephridia are segmentally arranged excretory organs
present in earthworms.
(ii) On the basis of their location, three types of
nephridia are found in earthworms. They are:
(a) Septal nephridia: These are present on both sides of
the inter-segmental septa behind the 15th segment.
They open into the intestines.
(b) Integumentary nephridia: These lie attached to the
body wall from the third segment to the last segment, which opens
on the body surface.
(c) Pharyngeal nephridia: These are present as three
paired tufts in fourth, fifth, and sixth segments.
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