egmented Worms, Mollusks, Roundworms, and Joint-Legged Animals POST-LAB QUESTION

ID: 253636 • Letter: E

Question

egmented Worms, Mollusks, Roundworms, and Joint-Legged Animals POST-LAB QUESTIONS Introduction 1. Indicate the differences between protostomes and deuterostomes 2. List the animal phyla that are protostomes and those that are deuterostomes. 3. What happens to the coelom as each phyla of protostomes evolve? 4. Indicate the differences between protosomes and deuterosomes, and list the phyla of animals in each group 5. Describe ecdysis in roundworms and joint-legged animals. 19.1 Annelids (Phylum Annelida) 6. Briefly describe the life cycle of an earthworm. Secgmented Worms, Mollasks,Rounshworms, and Joint-Legoed Animals 401

Explanation / Answer

Answer 1

1. Cleavage is spiral and determinate.

2. Blastopore is developed into mouth.

3. No development of archenteron.

4. Ventral nerve cord is solid.

5. Schizocoelous Coelom formation.

6. Occurs in phylum Annelids, Arthropoda and mollusca.

Cleavage is radial and indeterminate.

Blastopore is developed into anal opening.

Development of archenteron takes place.

Nerve cord is hollow.

Enterocoelous coelom formation.

Echinodermata, Chordata and Hemichordata.

Answer 2

Protostomes

-Annelida

-Arthropoda

-Mollusca.

-Platyhelminthes

-Nematoda

Deuterostome

-Echinodermata

-Chordata

-Hemichordata

-Pogonophora

Answer 3

Protostomes are schizocoelous i.e coelom develops from splits in the mesoderm.

Answer 4 above answer 1 and 2.

Answer 5

Their is periodic loss of the outer covering of integument during growth in ecydsis of roundworms and joint-legged animals.

Protostomes Deuterostome