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Answer the following: (i) What is the function of nephridia? (ii) How many types of nephridia are found in earthworm based on their location?

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(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:

  • Septal nephridia: These are present on both sides of the inter-segmental septa behind the 15th segment. They open into the intestines.
  • Integumentary nephridia: These lie attached to the body wall from the third segment to the last segment, which opens on the body surface.
  • Pharyngeal nephridia: These are present as three paired tufts in fourth, fifth, and sixth segments.

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