G RI .1189900 10:10 PM Announcements animals 11) What are the differences betwee
ID: 265664 • Letter: G
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G RI .1189900 10:10 PM Announcements animals 11) What are the differences between protostomes and deuterostomes 12) What are the differences between acoelom, pseudocoelom and a coelom 13) What are the advantage of segmentation? 13) Worm evolution represents an excellent means of understanding the evolution of the body cavity. Using the phyla of the worms Nematoda, Annelida, Platyhelminthes and Nertea, construct a phylogenetic tree based only on the form of the body cavity 14) Why is it believed that echinoderms and chordates, whiclh are so dissimilar, are members of the same evolutionary line? 15) What are the major clades of protostomes? Discuss their distinguishing characteristics protostomes.ppt 16) Relate the anatomy of the tapeworm to its way of life 17) Discuss the defining characteristics of phylum Mollusca and give examples of four best known groups of mollusks 18) Discuss the life cycle of a nematode and how it produces disease in humans 19) What are the key features of arthropods. Name the four extant classes of arthropods and discuss the distinguishing characteristics 20) What are the advantages and disadvantages of an exoskeleton? 21) Why are the largest arthropods found in marine environments? 22) What benefit would being a hermaphrodite confer on a parasitic specie?Explanation / Answer
11) The difference between Protostomes and Deuterostomes:
The protostomes animals in which the mouth develops first and anus is formed later, while in deuterostomes, the excretory organ develops first in the embryo followed by development of mouth.
In protostomes cleavage is spiral and determinate types, while in deuterostomes cleavage is radial.
First opening developed by a protostome is the mouth and This opening, the blastopore, becomes the excretory part of a deuterostome in their embryonic development.
Protostome includes arthropods, molluscs and annelid worms, while deuterostomes includes Chordata, Echinochordata and hemichordate.
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