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Cnidarian & Ctenophore Exam

Total questions: 43

Worksheet time: 58mins

Name
Class
Date
1.

What trait gives jellies in the Phylum Ctenophora their common name?

a)

Box shape

b)

Combs

c)

Tentacles

d)

Polyps

2.

Which of the following is NOT a class of cnidarians?

a)

Ctenophora

b)

Anthozoa

c)

Scyphozoa

d)

Cubozoa

3.

When a Cnidarian catches prey, it uses stinging cells called...

a)

Colloblasts

b)

Stingers

c)

Cnidocytes

d)

Blastoscytes

4.

When a Cnidarian catches prey, it uses stinging cells called...

a)

Colloblasts

b)

Stingers

c)

Cnidocytes

d)

Blastoscytes

5.

After a cnidarian has stung it's prey, it uses it's tentacles to pull the food into the hollow space inside of it's body. This space is called the...

a)

Mesoglea

b)

Mesoderm

c)

Gastrovascular Cavity

d)

Stomach

6.

Which of the following is a correct description of the polyp body form?

a)

It's mostly sessile and the tentacles point downward.

b)

It's mostly sessile and the tentacles point upward.

c)

It's mostly mobile and the tentacles point downward.

d)

It's mostly mobile and the tentacles point upward.

7.

Which group of Cnidarians have a symbiosis with algae?

a)

anemones

b)

corals

c)

jellyfish

d)

comb jellies

8.

Which group of Cnidarians have a symbiosis with algae?

a)

anemones

b)

corals

c)

jellyfish

d)

comb jellies

9.

What surrounds the mouth of cnidarians?

a)

arms

b)

combs

c)

tentacles

d)

spines

10.

_____ are box-shaped medusa.

a)

Anthozoans

b)

Scyphozoans

c)

Cubozoans

d)

Hydrozoans

11.

The _____ enables cnidarians to respond to stimuli in their environment and send electrical impulses to the muscles.

a)

nerve net

b)

brain

c)

peripheral nerves

d)

nerve cord

12.
Which body form is represented by this diagram?
a)
Mesoglea
b)
Medusa
c)
Polyp
d)
Polyp changing into medusa
13.

What is a defining characteristic between a cnidarian and a ctenophore?

a)

Ctenophores are freshwater and cnidarians are marine

b)

cnidarians have stinging cells and ctenophores don't

c)

ctenophores have stinging cells and cnidarians don't

d)

ctenophore is another name for cnidarian

14.
Which of the following are not Cnidarians?
a)
Jellyfish
b)
Coral
c)
Hydras
d)
Comb Jellies
15.

What is the "jelly" found in jellyfish that help them float easily?

a)

Mesoglea

b)

Grape

c)

Cellulose

d)

Melanin

16.

If you are stung by a jellyfish, what are the TWO treatments you can use to relieve the sting?

a)

freshwater on the sting

b)

urine on the sting

c)

vinegar on the sting

d)

saltwater on the sting

17.

Which of these are typically colonial?

a)

corals

b)

jellyfish

c)

hydras

d)

anemones

18.

What type of skeleton do cnidarians have?

a)

hydrostatic

b)

exoskeleton

c)

endoskeleton

d)

spicules

19.

Hydras are members of the class

a)

Staurozoa

b)

Cubozoa

c)

Hydrozoa

d)

Anthozoa

20.

What are the organelles inside the stinging cells that inject paralyzing toxins into their prey?

a)

pinacocytes

b)

lysomatocyts

c)

choanocytes

d)

nematocysts

21.

How many tissue layers do Cnidarians feature?

a)

1 - monoblastic

b)

2 - diploblastic

c)

3 - triploblastic

d)

depends on the species

22.

True jellies belong to the class _______.

a)

Staurozoa

b)

Anthozoa

c)

Cubozoa

d)

Scyphozoa

23.

What is this organism? What Class does it belong to?

a)

jellyfish:scyphozoa

b)

Portuguese man-of-war:hydrozoa

c)

hydra:hydrozoa

d)

coral:anthozoa

24.

A colonial cnidarian is...

a)

coral

b)

comb jellies

c)

jellyfish

d)

sea anemones

25.
The outer layer of the Cnidarian is called...
a)
enteron
b)
epidermis
c)
mesoglea
d)
nematocyst
26.
The venom that is stored in the cnidoblasts is delivered through the
a)
operculum
b)
enteron
c)
mesogea
d)
nematocysts
27.
All cnidarians reproduce....
a)
sexually 
b)
asexually
28.

The class of Cnidarians that live in colonies mostly are

a)

anthozoan

b)

sycphozoan

c)

cudozoan

d)

hydrozoan

29.
Polyps are ______, while medusa are ______. 
a)
sessile, motile
b)
motile, sessile
c)
both motile and sessile, just motile
30.

One way comb jellies are different from jelly fish is....

a)

They don't have nematocysts.

b)

They don't have mesoglea.

c)

They are bioluminescent

d)

They are only found in Florida.

31.

This is a member of...

a)

cnidaria

b)

ctenophora

c)

profiera

32.
Anemones and Corals are in which kingdom?
a)
Protista
b)
Cubozoa
c)
Animalia
d)
Cnidaria
33.

In Cnidarians, digestion occurs in the ______.

a)

epidermis

b)

manubrium

c)

Gastrovascular cavity

d)

tentacles

34.
What form is this organism? (Image 1)
a)
Polyp
b)
Medusa
35.
Which of the following is a correct description of the polyp body form?
a)
It is sessile and the tentacles and mouth point downward.
b)
It is sessile and the mouth and tentacles point upward.
c)
It is mobile and the tentacles and mouth point downward.
d)
It is mobile and the tentacles and mouth point upward.
36.
What type of symmetry do cnidarians have
a)
asymmetrical
b)
bilateral
c)
radial
37.

What has a mutualistic relationship with coral and lives within its tissues?

a)

small fish

b)

larvae

c)

hydra

d)

zooanthellae

38.

Which Cnidarians have the most economic importance to humans?

a)

sea anemones

b)

jellyfish

c)

reef-building corals

d)

sea pens

39.

Cnidarians are most abundant in what type of environment?

a)

warm, polar, deep marine environments

b)

warm, tropical, shallow marine environments

c)

cold, polar, shallow marine environments

d)

cold, tropical, deep freshwater environments

40.

The skeleton, and the calyx, of corals is made out of what substance?

a)

silica

b)

calcium carbonate

c)

silica carbonate

d)

phosphorous

41.
Cnidarians have two body layers: epidermis and ________________. 
a)
Vascodermis
b)
Gastrodermis
c)
Microdermis
d)
Innerdermis 
42.
Cnidarians have a trait called dimorphism. This means that....
a)
They can change size whenever they are being chased.
b)
They camouflage to blend in with various organisms.
c)
They have three body forms.
d)
They have two body forms.
43.

Which part of a cnidarian's body is waste dispelled from?

a)

the gastrodermis

b)

the tentacles

c)

the mesoglea

d)

the gastrovascular cavity

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