9 Major Animal Phyla

Question 1

These organisms differ from Chordates in terms of embryonic development. They exhibit spiral cleavage.

Answer 1

Protostomes

Question 2

Incomplete digestive system, radial symmetry

Answer 2

Cnidaria

Question 2

This phylum has an asymetrical appearance

Answer 2

Porifera

Question 3

Internal, Limy skeleton

Answer 3

Echinodermata

Question 4

complete digestive system, water-vascular system

Answer 4

Echinodermata

Question 4

The Class Cephalopoda is a part of which Phylum?

Answer 4

Mollusca

Question 5

T/F: All Molluscs have a hard, external shell

Answer 5

False

Question 6

insecta, crustacea, arachnida

Answer 6

Arthropoda

Question 7

T/F: Octopi and squids are considered molluscs, but they have 8 “feet.”

Answer 7

False. Octopi and Squid have multiple tentacles, and one “head-foot.”

Question 8

Gastropods

Answer 8

Mollusca

Question 9

These two phyla both have radial symmetry

Answer 9

Cnidaria, Echinodermata

Question 10

unsegmented, complete digestive system, pseudocoelomate

Answer 10

Nematoda

Question 11

paired, jointed appendages

Answer 11

Arthropoda

Question 12

Sessile feeders

Answer 12

Porifera

Question 12

Earthworms

Answer 12

Annelida

Question 14

nematocysts are a characteristic of this Animal Phylum

Answer 14

Cnidaria

Question 16

roundworms

Answer 16

Nematoda

Question 18

One stage of ths phyla’s life cycle is called a medusa

Answer 18

Cnidaria

Question 19

unsegmented, one muscular foot

Answer 19

Mollusca

Question 20

flatworms

Answer 20

Platyhelminthes

Question 21

no distinguishable germ layers

Answer 21

Porifera

Question 21

Coelomate protosome, segmented body

Answer 21

Annelida

Question 22

T/F: Echinoderms have an internal digestive system.

Answer 22

False.

Question 23

chitin exoskeleton

Answer 23

Arthropoda

Question 25

Chordates and Echinoderms are examples of these coelomate organisms.

Answer 25

Deuterostomes

Question 26

incomplete digestive system, eyespots

Answer 26

Platyhelminthes

Question 27

T/F: All Chordates, Arthropods, and Annelids exhibit bilateral symmetry.

Answer 27

True.

Question 28

Dorsal Nerve Chord

Answer 28

Chordata

Question 29

Has a radula

Answer 29

Mollusca

Question 30

Notochord

Answer 30

Chordata

Question 31

Internal Hydrostatic skeleton

Answer 31

Annelida, Echinodermata

Question 32

"Exoskeleton" composed of calcium carbonate

Answer 32

Molluscs

Question 33

Elephantiasis can be caused by these

Answer 33

Nematodes

Question 34

Platyhelminthes use this. It extends through the mouth.

Answer 34

the Pharynx

Question 35

Which phyla contains hydra-like organisms with a digestive cavity and only one opening that serves as both the mouth and the anus?

Answer 35

Cnidaria