Question

define the following terms
1. coelomat
2. notochord
3. radical semetry
4. triploblastic

Answer 1

Bilateral symmetry is the symmetry in which an organism is exactly divided into right and left halves by a single line of symmetry. e.g. Butterfly.
Coelom is the body cavity filled with fluid that runs the complete length of vertebrates to divide the body of an organism into inner tube and outer tube.
Triploblastic organization is represented by embryos possessing three germinal layers namely external ectoderm, middle mesoderm and inner endoderm. e.g. Members of platyhelminthes representtriploblastic organization .

Answer 2

Coelomate animals or Coelomata (also known as eucoelomates — "true coelom") have a body cavity called a coelom with a complete lining called peritoneum derived from mesoderm (one of the three primary tissue layers). ... Most bilateral animals, including all the vertebrates, are coelomates.



notochord is a flexible rod made out of a material similar to cartilage. If a species has a notochord at any stage of its life cycle, it is, by definition, a chordate. In vertebrates the notochord becomes part of the vertebral column. ... The notochord is found ventral to the neural tube.



radial symmetry. Symmetrical arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis. The body plans of echinoderms, ctenophores, cnidarians, and many sponges and sea anemones show radial symmetry



triploblastic. adjective. Having body tissues derived from three germ layers, the endoderm, mesoderm, and ectoderm, seen in all multicellular animals except certain invertebrates such as the cnidarians and sponges.



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