Question

What kind of neural organization can be seen in lower vertebrates?

• A. Simple neural system
• B. Complex neural system
• C. Highly developed neural system
• D. Very poor neural system

Answer 1

The correct option is A Simple neural system

The neural organisation is very simple in lower invertebrates. Invertebrates have immensely diverse nervous structures and body plans, revealing the variety of solutions evolved by animals living successfully in all kinds of niches.

The most advanced class among the invertebrates is the Cephalopoda, which possess the largest invertebrate nervous system.
Lower invertebrates have simple nervous systems such as a circular nerve net or a chain of segmentally organized ganglia. Such anatomical organization may represent a more distributed form of control, where sensory-motor integration occurs closer to the body part involved.

More advanced nervous system allows vertebrates to receive, process, and respond in greater variety to distant stimuli in the animal's direction of travel.