Rotifera nervous system is described as what?

• A. Cerebral ganglia (brain) with nerves extending through the body
• B. Ventral nerve cord
• C. Nerve ring around mouth
• D. No nervous system

Answer: (A)

Rotifers have a simple centralized nervous system with a pair of cerebral ganglia at the anterior end that function like a tiny brain. Nerve fibers extend from these ganglia through the body to innervate feeding structures and locomotion, giving the animal coordinated control without a long ventral nerve cord. This setup is more accurate for rotifers than having a ventral nerve cord or a nerve ring around the mouth, and it clearly shows that there is a nervous system present.