Q.2:- 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 regulate the volume and composition of the body fluids.
(ii) There are three types of nephridia found in earthworm:
• Septal nephridia: present on both the sides of intersegmental septa of segment 15 to the last that open into intestine
• Integumentary nephridia: attached to lining of the body wall of segment 3 to the last that open on the body surface
• Pharyngeal nephridia: present as three paired tufts in the 4th , 5th and 6th segments.