A) enteronephric
B) exonephric
C) sometimes enteronephric and sometimes exonephric
D) both [a] and [b]
Correct Answer: B
Solution :
According to location in the body 3 types of nephridia are found in earthworm. (i) Pharyngeal nephridia : These occur as paired tufts on either side of pharynx and oesophagus in 4, 5th and 6 segment. These are enteronephric. (ii) Integumentary nephridia: These are scattered on the entire inner surface of body wall in all the segments except first two. These are exonephric. (iii) Septal nephridia : These are attached to both the faces of each in tersegmental septum behind 15th segment onwards. These are enteronephric.
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