Question

The simplest form of nervous system found in cnidarians is called as

• A. Nerve-trunk system
• B. Ladder system
• C. Nerve-net system
• D. Nerve-cord system

Answer 1

The correct option is C Nerve-net system

Nerve net found in many cnidarians is a part of more advanced nervous systems. Cytoplasmic processes join the nerve cells (neurons) of nerve nets. In cnidarians, the neurons are joined to epithelial receptors and to contractile cells. In vertebrates, nerve nets may be found around blood vessels and the alimentary tract. The nerve net is the simplest form of a nervous system found in multicellular organisms. Unlike, central nervous systems where neurons are typically grouped together, neurons found in nerve nets are found spread apart. This nervous system allows cnidarians to respond to physical contact. They can detect food and other chemicals in a rudimentary way. While the nerve net allows the organism to respond to its environment, it does not serve as a means by which the organism can detect the source of the stimulus. For this reason, simple animals with nerve nets, such as Hydra, will typically produce the same motor output in response to contact with a stimulus regardless of the point of contact.

Therefore, the correct answer is option C.