In Pheretima,nephridia occur in: | vedclass

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(A) In $Pheretima$,nephridia are segmentally arranged excretory organs.They are classified based on their location as septal,integumentary,and pharyng

Vedclass · Accepted Answer

All segments except $1-3$ and the last segment

Vedclass · Answer

(A) In $Pheretima$,nephridia are segmentally arranged excretory organs.They are classified based on their location as septal,integumentary,and pharyngeal nephridia.Nephridia are absent in the first three segments $(1, 2, 3)$ and the last segment.While most nephridia are of the micronephridia type,the septal nephridia are often considered meganephridia due to their larger size compared to others.

Column-$I$	Column-$II$
$1$. Spermathecae	$a$. $6^{th}$ to $9^{th}$ segments
$2$. Typhlosole	$b$. $1^{st}$ to $3^{rd}$ segments
$3$. Buccal cavity	$c$. $26^{th}$ to $35^{th}$ segments in intestine
$4$. Pharyngeal nephridia	$d$. $4^{th}$ to $6^{th}$ segment

In $Pheretima$,nephridia occur in:

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