Question Detail
Question
Which phylum is described as having a 'ladder-type' nervous system with cerebral ganglia?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Under 'Phylum Platyhelminthes (Flatworms)', it is stated: 'Nervous system: Primitive 'ladder-type' with cerebral ganglia (primitive brain).'
Hint
This is a characteristic of flatworms.