Question
Biology Question on Kingdom Animalia
In contrast to annelids the platyhelminths show
A
radial symmetry
B
presence of pseudocoel
C
bilateral symmetry
D
absence of body cavity
Answer
absence of body cavity
Explanation
Solution
Flatworms, also known as Platyhelminthes, do not possess a body cavity apart from the digestive tract, and they also lack an anus. In contrast, annelids have a fluid-filled cavity situated between the outer body wall and the digestive tract, which is known as a coelom.
So, the correct option is (D): absence of body cavity