Question

Define Protostomes and Deuterostomes

Answer 1

Protostomes - A multicellular organism whose mouth develops from a primary embryonic opening , such as an annelid , mollusc or arthropod .
Deuterostomes - An organism whose mouth develops separately from blastopore .

Answer 2

In Protostomes, the mouth of the digestive tract develops first in the embryo and anus is formed later,
e.g. flatworms, roundworms, annelids, molluscs and arthropods.


In Deuterostomes, the anus of the digestive tract develops first in the embryo and the mouth is formed later,
e.g. echinoderms, hemichordates and chordates.