Question

Number of septal nephredia in each segment of earthworm are-

• A. 160-200
• B. 20-25
• C. 80-100
• D. 40-50

Answer 1

The correct option is C 80-100

The Septal nephridia of earthworm are the largest nephridia present in a earthworm and are responsible for excretion.
Each septum has about 40 to 50 nephridia in front and the same number behind, so that each segment possesses 80 to 100 septal nephridia except the ${15}^{th}$ segment which has only 40 to 50 nephridia. These are not found in the segments up to ${14}^{th.}$
So, the correct answer is- 80-100.