Animals A

Question 1

Sponges, known as _____, differ from other animals by _____.

Answer 1

parazoa

lacking tissues

Question 2

All animals except sponges are known as _____ and differ from sponges by ______.

Answer 2

eumetazoa

having tissues

Question 3

Most animals form three cell layers; known as _____. These are …

Answer 3

triploblastic

1. endoderm - innermost layer
2. mesoderm - middle layer
3. ectoderm - outermost layer

Question 4

Eumetazoans have symmetry, and are divided into two different types: ….

Answer 4

1. Radiata - radial symmetry

2. Bilateria - bilateral symmetry

Question 5

acoelomate - animal

Answer 5

no body cavity separates the gut and body wall

-flatworms

Question 6

pseudocoelomate - animal

Answer 6

pseudocoelomate (fluid or organ-filled space) forms between the gut and body wall
-roundworms

Question 7

coelomate - animal

Answer 7

coelom (fluid-filled body cavity) is lined peritoneum

-humans

Question 8

scientists describe the body plan of pseudocoelomate and coelomate as…

Answer 8

a tube within a tube

Question 9

The fluid within the cavity (in pseudos and coelomates) serve as ….

Answer 9

hydrostatic skeletons to provide support.

Question 10

Protostomes include what types of animals

Answer 10

invertebrates

Question 11

Protostome eggs cleave how?

What kind of cleavage is this?

Answer 11

spirally

determinate cleavage

Question 12

Deuterostomes include what types of animals?

Answer 12

vertebrates

Question 13

Deuterostome eggs cleave how?

Answer 13

radially

indeterminate cleavage

Question 14

Benefits of segmented body?

Answer 14

each segment has own set of independent muscles

More flexibility of movement