How many germ layers are present in the embryo of a highly advanced animal?
Which of the following is not the basis for the further classification of eumetazoa?
Animals having identical right and left sides are also known as
The organisms in which the body cavity does not arise from mesoderm and is not lined by epithelial cells are:
A pseudocoelomate is an organism with body cavity that is not derived from the mesoderm, as in a true coelom, or body cavity. A pseudocoelomate is also known as a blastocoelomate, or cavity within the embryo.
Which of the following have cells that are properly arranged into tissues and organs?
Multicellular animals are called Metazoa which have been divided into two branches: Parazoa and Eumetazoa.
Which of the following organism is radially symmetrical?
Hydra and Cnidarians are radially symmetrical - able to asexually divide into identical pie-shaped segments, like a flower pot. Cnidarians also feature tentacles with stinging cells. An organism with radial symmetry has body parts arranged like pieces of a pie around an imaginary central axis.
Who classified animals according to their habitat (air, water or land)?
True coelom originates from which germ layer?
A true coelom arises entirely within the mesoderm germ layer. Animals such as earthworms, snails, insects, starfish, and vertebrates are all eucoelomates. A third group of triploblasts has a body cavity that is derived partly from mesoderm and partly from endoderm tissue. These animals are called pseudocoelomates.
On the basis of origin of mouth, animals have been categorized into
On the basis of origin of mouth, animals have been categorized into : -
Protostomia ( mouth arising from or near the blastopore of gastrula)
Deuterostomia ( mouth arising anteriorly at some distance from the blastopore)
Which of the following is not the characteristic of animals?