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Exonephric secretion in earthworm is by :-

$\begin{array}{1 1}(A)\;\text{Septal nephridia}\\(B)\;\text{Pharyngeal nephridia}\\(C)\;\text{Integumentary nephridia}\\(D)\;\text{Both (B) & (C)}\end{array} $

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Septal and pharyngeal nephridia drain into GIT whereas Integumentary secrete the excreta outside.
Hence (C) is the correct answer.
answered May 6, 2014 by sreemathi.v
 

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