Animal Characteristics

Question 1

How many species of existing animals have been identified?

Answer 1

1.3 million

Question 2

Movement: Sessile def and example

Answer 2

attached and non-moving; sponges

Question 3

Movement: sedentary def and example

Answer 3

move very little

clam

Question 4

Movement: motile def

Answer 4

animals that can move

Question 5

What do all animals have to provide energy for movement?

Answer 5

muscular tissue

Question 6

What is a zygote and what does is form?

Answer 6

• fertilized eggs that undergoes rapid cell divisions called cleavage.
• it forms hollow ball of cells called blastula

Question 7

Sperm + Cell = ?

Answer 7

Zygote

Question 8

What is a blastocoel and how many germ layers does it have?

Answer 8

center cavity of blastula

1 germ layer

Question 9

What is the germ layer of a blastocoel called?

Answer 9

blastoderm

Question 10

What is the opening of a blastula called?

Answer 10

blastopore

Question 11

What is the center/primitive gut of a blastula called?

Answer 11

an archenteron

Question 12

Process of embryonic development

Answer 12

zygote - blastula - gastrula

Question 13

Body Cavities: a blastopore may become what?

Answer 13

the mouth or the anus

Question 14

Body Cavities: examples of protostomes

Answer 14

mollusks, anthropoids, annelids

Question 15

Body Cavities: examples of deurterostomes

Answer 15

echinoderms and vertebrates

Question 16

Germ Layers: what do they form and which organism does not have them?

Answer 16

form tissues, organs, and systems

not present in sponges

Question 17

Ectoderm layer: which layer? what does it form?

Answer 17

outer layer

forms skin, nerves, sense organs

Question 18

Endoderm layer: which layer? what does it form?

Answer 18

inner

digestive tract, liver, and lungs

Question 19

Mesoderm: which layer? what does it form?

Answer 19

middle

muscles and other organs between digestive tract and outer covering

Question 20

Coelem: definition

Answer 20

body cavity in bilaterally symmetrical animals

Question 21

Coelem: internal body cavity fully lined with what?

Answer 21

mesoderm

Question 22

Acoelomate’s definition and examples

Answer 22

have solid bodies filled with cells

sponges, cnidarians, flatworms

Question 23

Pseudocoelomates definition and examples

Answer 23

have functional body cavity NOT fully lined with mesoderm

roundworms