Question

Which among the following options hold true for the nervous system of chordates?

• A. A brain is present, dorsal nerve cord, highly developed receptors
• B. A brain is present, fused ganglia, ventral nerve cord
• C. No brain, fused ganglia, tympanic membrane
  
• D. No brain, nerve net, modified neurons

Answer 1

The correct option is A A brain is present, dorsal nerve cord, highly developed receptors

Nervous system of organisms in Chordates or Phylum Chordata have:

• Brain: central information processing organ;
• a dorsal nerve cord; and
• highly developed sensory receptors

There is some kind of nervous system in other phylums too except Porifera. Tympanic membrane is present in Chordates. Fused ganglia and ventral nerve cord is seen in arthropods.