Search any question & find its solution
Question:
Answered & Verified by Expert
In which one of the following organism, its excretory organs are correctly stated?
Options:
Solution:
2707 Upvotes
Verified Answer
The correct answer is:
Earthworm - Pharyngeal, integumentary and septal nephridia
In earthworm, excretory system is made up of many segmentally arranged microscopic coiled tubes called nephridia. These are ectodermal in origin and analogous to vertebrate kidney.
In Pheretima, following three types of nephridia are seen.
(i) Pharyngeal nephridia-Situated in either side of pharynx and oesophagus in $4^{\text {th }}, 5^{\text {th }}$ and $6^{\text {th }}$ segment.
(ii) Integumentary nephridia-Scattered in the body wall, seen from $7^{\text {th }}$ segment onwards.
(iii) Septal nephridia-Largest nephridia attached to both faces of each intersegment septum behind $15^{\text {th }}$ segment.
In Pheretima, following three types of nephridia are seen.
(i) Pharyngeal nephridia-Situated in either side of pharynx and oesophagus in $4^{\text {th }}, 5^{\text {th }}$ and $6^{\text {th }}$ segment.
(ii) Integumentary nephridia-Scattered in the body wall, seen from $7^{\text {th }}$ segment onwards.
(iii) Septal nephridia-Largest nephridia attached to both faces of each intersegment septum behind $15^{\text {th }}$ segment.
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.