Section 21.3- Coelenterates: Hollow-Intestined Invertebrates

Question 1

consists of jelly-fish, sea anemones, corals, and hydras

hollow-intestined invertebrates

Answer 1

Coelenterates

Question 2

stinging cells possessed by Coelenterates

Answer 2

cnidocytes

Question 3

have a saclike body with a central digestive cavity that has a single opening, or mouth, through which food enters and wastes are expelled

Answer 3

Coelenterates

Question 4

extend from the body and surround the mouth

used for capturing prey

Answer 4

tentacles

Question 5

organelle contained in each cnidocyte which delivers the sting

Answer 5

nematocyst

Question 6

the most characteristic structural features of coelenterates

Answer 6

tentacles and stinging cells

Question 7

the body of coelenterate is made up of two layers:

Answer 7

ectoderm (outer layer)
endoderm (inner layer)

Question 8

between the two layers of coelenterate is a jellylike middle layer composed of protein fibrils and sugars

Answer 8

mesoglea

Question 9

two body forms of a coelenterate

Answer 9

polyp
medusa

Question 10

a cylindrical body type that is sessile and has its mouth facing upward

reproduces asexually

Answer 10

polyp

Question 11

a free-swimming, umbrella shaped body type that has its mouth facing downward

reproduces sexually

Answer 11

medusa

Question 12

a small freshwater coelenterate of the polyp form

Answer 12

hydra

Question 13

a free-swimming coelenterate with a medusa type of body structure

Answer 13

adult jellyfish

Question 14

jellyfish in N. America that may occasionally measure more than 6 feet in diameter

Answer 14

lion’s mane jellyfish

Question 15

Jelly fish undergo ____________________________
when they reproduce

Answer 15

alternation of generations

Question 16

means using sexual and asexual methods alternatively to reproduce

Answer 16

alternation of generations

Question 17

fertilized egg

Answer 17

zygote

Question 18

zygote develops into a

Answer 18

larva

Question 19

beautiful flowers of the ocean named after the daisylike flower

have a polyp type body

Answer 19

seas anemones

Question 20

a colonial coelenterate

Answer 20

coral

Question 21

because millions of corals live together in colonies, limestone cups eventually form vast limestone structures called

Answer 21

coral reefs

Question 22

corals grow in

Answer 22

warm,shallow waters

Question 23

noted for its numerous coral reefs

Answer 23

Coral Sea

Question 24

the world’s largest coral reef

Answer 24

Great Barrier Reef

Question 25

make up the order Porifera

Answer 25

sponges

Question 26

the only multicellular animals that do not have at least a rudimentary nervous system m

Answer 26

sponges

Question 27

a hollow, saclike animal with a large opening opposite its base

Answer 27

sponge

Question 28

the body opening, or mouth, of a sponge is called the

Answer 28

osculum

Question 29

opening through which water leaves a sponge (porifera) is called the

Answer 29

excurrent pore

Question 30

water enters the sponge through _________________
located in the sides of the sponge

Answer 30

ostia (incurrent pores)

Question 31

the outer layer of cells of a sponge which provide it with its outer covering

Answer 31

epidermal cells

Question 32

the inner layer of cells which line the sponge’s body cavity

Answer 32

collar cells

Question 33

fills the space between the collar cells and the pore cells

Answer 33

mesoglea

Question 34

the crystalline support structures of the sponge

Answer 34

spicules

Question 35

sponges obtain the nutrient materials they need from the

Answer 35

water

Question 36

sponges may reproduce

Answer 36

asexually or sexually

Question 37

one way that sponges reproduce asexually is by

Answer 37

budding