NEET BIOLOGY

Detailed explanation-1: -Sponges are multicellular animals, unique in many ways. They are the only group of animals that can be classified as asymmetric, which means they possess no symmetry at all. There is no plane through their bodies where you could cut them in half to produce two mirror images. Q.

Detailed explanation-2: -Only sponges (phylum Porifera) have asymmetrical body plans. Some animals start life with one type of body symmetry, but develop a different type as adults; for example, sea stars are classified as bilaterally symmetrical even though their adult forms are radially symmetrical.

Detailed explanation-3: -Sponges are asymmetrical because they are extremely simple. They live in the ocean, cannot move on their own, and have no complex organs or other features that higher-order animals have. Sponges are one of only a few types of animals classified as having asymmetry.

Detailed explanation-4: -Sponges are unsymmetrical or radially symmetrical, with many cell types but no distinct tissues; their bodies contain numerous pores and sharp protective spicules. Coelenterates (phylum Cnidaria) are radially symmetrical, with two tissue layers (ectoderm and endoderm) surrounding an all-purpose gastrovascular cavity.

Detailed explanation-5: -Sponges have no body plan and are asymmetrical.