Question

Define the following terms:
(a) Triploblastic (b) Coelomate
(c) Notochord (d) Bilateral symmetry

Answer 1

a) Triploblastic : Three germ layers (mesoderm,ectoderm,endoderm) develop during embryonic development , e.g. phylum Platyhelminthes to Chordata.

(b) Coelomate : those animals having a body cavity called coelom with a complete lining derived from mesoderm ,e.g. Annelids to Chordates.

(c) Notochord : A cartilaginous flexible rod supporting the body in all stages of life and some adult chordate animal.

(d) Bilateral Symmetry : Body can be divided into identical right and left halves in only one plane, e.g. Annelida to Chordata.