Question

Define the term and give one example
Triploblastic.

Answer 1

It includes three germ layers (mesoderm, ectoderm, endoderm) develop all through embryonic development, e.g. phylum Platyhelminthes to Chordata.

Complete answer: To answer this question, at first, we have to know the definition of triploblastic. Triploblastic organism is an organism wherein the body tissues have originated from three clear layers particularly the ectoderm, endoderm and the mesoderm. All the organisms initiate from a single cell referred to as the zygote this is formed as a fusion among the male and the female gamete.
This zygote undergoes sets of mitotic divisions to form the blastula. At this stage the cells of the foetus are divided into three clear layers particularly the ectoderm, endoderm and the mesoderm.

Additional Information: Germ layers help to arise all of the tissues/organs of the completely formed individuals. Based on the number of germ layers of animals can be-
Diploblastic- Diploblastic the body cells are organized in layers on outer ectoderm and on internal endoderm, e.g., Coelenterates.
Triploblastic- Triploblastic Body wall of animals is made from 3 germ layers- ectoderm, mesoderm and endoderm e.g., Platyhelminthes to chordates.
All "higher" and "intermediate" animals, from flatworms to humans, are triploblastic and belong to the Bilateria subregnum. Simpler animals recognized as diploblastic, together with cnidaria (which incorporates jellyfish, corals and hydra), consist of two germ layers.

Note: Triploblastic Applied to animals wherein the body wall is derived from 3 embryonic layers together with the ectoderm, mesoderm and endoderm.
All Animalia different from Coelenterata are triploblastic.