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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?
(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 the minute openings found in all segments excepts the first two and their function is to discharge of nitrogenous waste.
(ii) There are three types of nephridia -
(i) Septal nephridia - Present on both the sides of intersegmental septa of segment 15 to the last that open into intestine.
(ii) Integumentary nephridia -Attached to the lining of the body wall of segment 3 to the last that open on the body surface.
(iii) Pharyngeal nephridia - Present as three paired tufts in the $4^{\text {th }}, 5^{\text {th }}$ and $6^{\text {th }}$ segments.
These three different types of nephridia are almost similar in structure.
(ii) There are three types of nephridia -
(i) Septal nephridia - Present on both the sides of intersegmental septa of segment 15 to the last that open into intestine.
(ii) Integumentary nephridia -Attached to the lining of the body wall of segment 3 to the last that open on the body surface.
(iii) Pharyngeal nephridia - Present as three paired tufts in the $4^{\text {th }}, 5^{\text {th }}$ and $6^{\text {th }}$ segments.
These three different types of nephridia are almost similar in structure.
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