Q. Which of the following animals have a single opening to the outside that serves both as mouth as well as anus?
A) Octopus
B) Asterias
C) Ascidia
D) Fasciola
Explanation
Fasciola hepatica (Sheep lever fluke) belongs to phylum-Platyhelminthes. These worms have incomplete alimentary canal, there is a single opening for both digestion and egestion. This is also called as blind sac body plan.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.