EVERYDAY SCIENCE

Detailed explanation-1: -Cnidarians do not have a centralized nervous system, but they do have this nervous tissue layer that is found in the mesoglea. Statocyst: This organ-like structure provides balance to cnidarians.

Detailed explanation-2: -Introduction. Cnidarians are frequently referred to as “nerve net animals, ” even though the majority of extant species show some form of centralization of the nervous system in addition to the acknowledged organization of a nerve net in many areas of the body ( Mackie 2004; Garm et al.

Detailed explanation-3: -Answer and Explanation: The option that is NOT correct is: (a) The adult body is bilaterally symmetrical. The adult cnidarians are not bilaterally symmetrical.

Detailed explanation-4: -Sponges are the only multicellular animals without a nervous system. They do not have any nerve cells or sensory cells. However, touch or pressure to the outside of a sponge will cause a local contraction of its body. The hydra has a nervous system characterized by a nerve net.

Detailed explanation-5: -Most cnidarians, such as those of the genus Hydra, have what is called a nerve net-a meshlike system of individual and separate nerve cells and fibres dispersed over the organism.