Question

Enteronephric nephridia of Earthworm are

• A. Pharyngeal and septal
• B. Pharyngeal
• C. Septal
• D. Integumentary

Answer 1

Answer: (A)

Pharyngeal and septal

Septal nephridia have an opening into the intestine of either the left or the right supra-intestinal excretory duct. The waste collected by the nephridia is discharged through the excretory canals and ducts into the lumen of the intestine. Such nephridia opening into the intestine are called enteronephric nephridia.

Pharyngeal nephridia also discharge their wastes into the alimentary canal and are, therefore, enteronephric but such enteronephric nephridia which open into the anterior region of the alimentary canal are called peptonephridia.

So the correct answer is 'Pharyngeal and septal'.