Intro to Animals (ch. 33)

Question 1

Which is NOT a characteristic of an animal? multicellular, heterotrophic, cell walls, motile

Answer 1

cell walls

Question 2

What is the origin of multicellularity?

Answer 2

Choanoflagellates, from Opisthokonta

Question 3

Evolutionary step process: tissues, body ____, and ___.

Answer 3

Tissues, body symmetry and coelom

Question 4

What is tissue?

Answer 4

formation of cells of different types; have a single structure/function

Question 5

Tissue origin/Embryonic tissue layers: diploblastic, ___blastic

Answer 5

triplo

Question 6

Germ layers: ___derm, mesoderm, ___derm

Answer 6

ectoderm, mesoderm, endoderm

Question 7

Diploblasts have what two germ layers?

Answer 7

Ecto and endoderm

Question 8

Triploblasts have what three germ layers?

Answer 8

Ecto, endo and mesoderm

Question 9

The mesoderm is where these things are located: Muscle, ____ system, Skeletal ____.

Answer 9

Musicle, Circulatory System, Skeletal system.

Question 10

What organisms have radial symmetry?

Answer 10

Ctenophores, cnidarians and echinodermata

Question 11

What organisms have bilateral symmetry?

Answer 11

Anthropodes, Platyhelminthes, nematodes, etc.

Question 12

What is this process called?

“The formation in animals of a distinct anterior region where sense organs (brain) and a mouth are clustered.”

Answer 12

Cephalization

Question 13

What is a coelom? An internal ____ - filled body cavity that is completely (or partially) lined with ____.

Answer 13

fluid, mesoderm

Question 14

How do we classify animals according to coelom?

Answer 14

acoelomate, psuedocoelomate and true coelomate

Question 15

What is pseudocoelomate?

Answer 15

A pseudocoelomate has coelom without mesoderm lining. (nematodes).

Question 16

Can you think of an animal that is a acoelomate?

Answer 16

Flatworms (platyhelminthes)

Question 17

Name this: The initial pore (blastopore) becomes the mouth. The anus forms later. The mesoderm blocks form in addition or separate from the gut; coelom cavities form within the mesoderm blocks

Answer 17

Protostome

Question 18

Name this: The initial pore (blastopore) becomes the anus. The mouth forms later. The mesoderm blocks form on either side of the gut and pinch off later forming coelom.

Answer 18

Deuterostome

Question 19

Name a phylum for multicellular only

Answer 19

Porifera (sponges)

Question 20

Are sponges bilateral or radial?

Answer 20

Neither. They are asymmetrical.

Question 21

Name two phylum that are diploblastic.

Answer 21

Ctenophora and Cnidaria

Question 22

Porifera (sponges) lack tissues, symmetry, internal ____. Adults are sessile while the larvae are _____.

Answer 22

skeleton, motile

Question 23

Cnidaria (anemones, coral, hydra, jellies) have ____ symmetry and are diploblastic.

Answer 23

radial