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1
of 25
Which of the following cell structures of a sponge do not match its function?

Collar cells — calcareous structures for support

Osculum — opening through which water leaves

Pore cells — opening through which water enters

Spongin — fibers for support

Gametes — reproduction

Question
2
of 25
Sponges and all filter feeders use which of the following as a food source?

Plankton only

All particulate matter suspended in water

Particulate matter that deposits on the bottom

Dead plankton only

Plant matter in the water

Question
3
of 25
A larva is best defined as which of the following?

Immature stage that is able to reproduce

Early colony of cells of fresh-water sponges

Early stage of development of an organism, typically part of the plankton

Sperm cell that lives free in the water

Egg that has been fertilized by more than one sperm

Question
4
of 25
Cnidarians share all of these features except which of the following?:

Nematocysts

Multicellular

Radial symmetry

Complete digestive tract with mouth and anus

Marine and fresh-water

Question
5
of 25
Most cnidarians are specialized as

filter feeders.

parasites.

carnivores.

herbivores.

feeders of organic matter on the bottom.

Question
6
of 25
Statocysts are structures used in

sensing balance.

capturing prey.

reproduction.

swimming movements.

digesting food.

Question
7
of 25
Which of the following surfaces is not found in bilaterally symmetrical animals?

Dorsal

Anterior

Posterior

Ventral

Aboral

Question
8
of 25
The development of bilateral symmetry in invertebrates has particularly influenced the evolution of a more complex

digestive system.

reproductive system.

skeleton.

mouth.

nervous system.

Question
9
of 25
Deposit-feeding animals feed on

blood and living tissues.

particulate matter in the water.

plankton from the water that passively enters the digestive system.

live prey.

organic matter that settles on the bottom.

Question
10
of 25
All molluscs

have a soft body often covered by a shell made of silica.

have a soft body covered by a mantle.

have an externally segmented body.

lack a larval stage.

lack a circulatory system.

Question
11
of 25
The radula and crystalline style of molluscs are part of the

reproductive system.

defensive mechanisms.

excretory system.

nervous system.

digestive system.

Question
12
of 25
Which of the following is a distinctive feature of arthropods?

Lack of a digestive system

Jointed legs

Gills in a mantle cavity

Proboscis used to capture prey

Lack of a brain

Question
13
of 25
Nematocysts are _______________ found in_______________.

feeding structures; sponges

reproductive structures; all invertebrates

gametes; echinoderms

stinging cells; cnidarians

cells for sight; mollusks

Question
14
of 25
Bivalves,
such as oysters, often secrete smooth material over rough impurities
inside of the shell. The structure that results is a _____________.

grain of sand

piece of coral

shell

larva

pearl

Question
15
of 25
The vestigial internal shell of a squid is called the _______________.

style

mantle

ink gland

pen

gonad

Question
16
of 25
Which of the following animals has a beak?

Squid

Jellyfish

Lobster

Sea cucumber

Sponge

Question
17
of 25
The compound eye of a lobster sees_______________.

colors but not shapes of objects

a complete image with each section of the eye

in black and white

one image for the entire eye

close up – but not at a distance

Question
18
of 25
Which of the following is not an echinoderm?

Sea cucumber

Sand dollar

Sea Anemone

Sea star

Sea urchin

Question
19
of 25
An adult sea star is said to be secondarily radially symmetrical because ________________.

every other animal has bilateral symmetry

the larva is bilaterally symmetrical

as a larva the animal is also radially symmetrical

as arms grow the animal changes symmetry

if an arm is lost a new arm can grow in its place

Question
20
of 25
If a fisherman wishing to get rid of sea stars chops arms off each that he finds, eventually

all sea stars in the area will have no arms.

no sea stars will be found in the area.

sea stars will eat all of the fish that the fisherman doesn’t catch.

there will be more sea stars in the area.

the bottom of the ocean will be littered with sea star arms.

Question
21
of 25
Copepods occupy what niche in a marine ecosystem?

Are low on the food chain and are planktonic

Are predators that feed on small fish

Roam the bottom of the ocean searching for detritus

Latch onto the bodies of whales and sea turtles

Make up most of periodic red tides

Question
22
of 25
Which
of the following lifestyle patterns would most benefit from organisms
being hermaphroditic? Animals that _________________.

never learned how to reproduce

change their sex at different stages in their life cycle

are social and live in large groups

can only feed at night

don’t come in contact with others of the same species very often

Question
23
of 25
The tube feet of a sea star operate as part of the ___________________.

digestive system

water vascular system

reproductive system

nervous system

molting process from larva to adult

Question
24
of 25
A sea cucumber confuses predators by ________________________.

moving one way and then quickly changing directions

jumping above the level the predator can reach

leaving its intestines behind

squirting out ink from an internal ink sac

making itself look much larger than it really is

Question
25
of 25
Which of the following animals is the closest evolutionarily to land animals?

Sea star

Clam

Sea cucumber

Cnidarian

Lancelet

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