Chapters 33 & 34

Question 1

The common jellyfish moves form the blastula state to a ciliated larva called a ___.

Answer 1

planula

Question 2

The genus Aurelia belongs to which class of cnidarians?

Answer 2

scyphozoa

Question 3

Name some of the characteristics of Porifera.

Answer 3

hermaphroiditic, multicellular, sessile

Question 4

Respiration in Porifera occurs through ___.

Answer 4

simple diffusion

Question 5

The jellylike substance between the two cell layers that make up the body of a Porifera is ___.

Answer 5

mesohyl

Question 6

Pores in teh body of the sponge wall where water enters the organism are the ___.

Answer 6

ostia

Question 7

Songin is ___.

Answer 7

protein fibers that make up the skelton of some sponges

Question 8

Bell-shaped cnidarians specialized for swimming occur in this form.

Answer 8

medusa

Question 9

cells that crawl around the body of a sponge and pick up and deliver nutrients are ___.

Answer 9

amoebocytes

Question 10

The inner cell layer of cnidarian is the ___.

Answer 10

gastrodermis

Question 11

The long coiled filament organelle specialized for paralyzing and capturing prey is ___.

Answer 11

nematocyst

Question 12

The characteristic that allows cells of a sponge to regroup into a new or same sponge is ___.

Answer 12

recognition

Question 13

This organ coordinates all of the body activities of a cnidarian.

Answer 13

nerve net

Question 14

A freshwater hydra reproduces ___ during warm summer months.

Answer 14

asexually

Question 15

Species Obelia and Physalia belong to which class of cnidarians?

Answer 15

hydrozoa

Question 16

The sea anemone and coral belong to which class of cnidarians?

Answer 16

anthozoa

Question 17

The sensory structure found in most ctenophores that allows the animal to sense its position in the water as well as coordinate its movements is the ___.

Answer 17

apical organ

Question 18

The digestive system of cnidarians as well as their form of indirect development classify them as ___.

Answer 18

protostomes

Question 19

flatworms have no need for circulatory or respiratory systems because ___.

Answer 19

the flattened body shape allows for diffusion of gasses into cells

Question 20

Name some facts about tapeworms.

Answer 20

They can infect a person who eats undercooked beef. They can grow very large in human intestines. They do not have a digestive system.

Question 21

What uses a snail as an intermediate host?

Answer 21

schistosoma

Question 22

Describe the eggs of ascaris.

Answer 22

They are carried by human waste. They can survive in the soil for years. Develop into larvae in the intestine.

Question 23

Name three types of roundworm that live a parasitic life.

Answer 23

ascaris, enterobius, trichinella

Question 24

The thick protective covering on endoparasitic flukes that prevents them from being digested by their host is the ___.

Answer 24

tegument

Question 25

Name some structures that help planarians deal with water entering their bodies by osmosis.

Answer 25

flame cells, excretory tubules, and cilia

Question 26

Taenia saginatus is a tapeworm from the class

Answer 26

cestoda

Question 27

The knob-shaped organ with hooks and suckers on a tapeworm is called the \_\_\_.

Answer 27

scolex

Question 28

The primary hosts of Taenia saginatus are \_\_\_.

Answer 28

humans

Question 29

Nematodes are \_\_\_.

Answer 29

pseudocoelomates

Question 30

Cnidarians are \_\_\_.

Answer 30

coelenterates

Question 31

Most trematodes enter their human host by \_\_\_.

Answer 31

boring through the skin and into the blood vessels

Question 32

Each mature tapeworm prolgottid \_\_\_.

Answer 32

contains both male and female reproductive organs; contains fertilized eggs that develop into larvae; is eliminated in feces

Question 33

The roundworm that feeds on blood from the intestinal wall of cats, dogs, and humans is the \_\_\_.

Answer 33

hookworm

Question 34

The intestinal parasite causing trichinosis is \_\_\_.

Answer 34

trichinella

Question 35

The most common parasitic worm infection in the U.S. is \_\_\_.

Answer 35

Enterobius

Question 36

The parasitic nematode that uses a mosquito as its vector is the \_\_\_.

Answer 36

Filaria

Question 37

Name some characteristics of rotifers.

Answer 37

They are 100-500 µm in size. They are free living and nonparasitic. They are multicellular with complex organ systems.

Question 38

The parasitic nematode affecting the lymphatic system and causing elephantiasis is \_\_\_.

Answer 38

filaria

Question 39

Name some characteristics of a ctenophore.

Answer 39

colloblasts, apical organ, bioluminescence

Question 40

parthenogenesis

Answer 40

rotifera

Question 41

amoebocytes

Answer 41

porifera

Question 42

flame cells

Answer 42

platyhelminthes or rotifera

Question 43

proglottids

Answer 43

platyhelminthes

Question 44

cnidocytes

Answer 44

cnidaria

Question 45

schistosoma

Answer 45

platyhelminthes

Question 46

nerve net

Answer 46

cnidaria

Question 47

choanocytes

Answer 47

porifera

Question 48

medusa

Answer 48

cnidaria

Question 49

mastax

Answer 49

rotifera

Question 50

acoelomates

Answer 50

platyhelminthes