Chapter 33: Invertebrates Pt.1

Question 1

Animals that lack a backbone, account for over 95% of known animal species

Answer 1

Invertebrates

Question 2

Occupy almost every habitat on Earth

Answer 2

Invertebrates

Question 3

Invertebrates are ____________ diverse, including species that microscopic and those that are 18 m long

Answer 3

Morphologically

Question 4

Sponges; are sessile, filter feeders that lack true tissues

Answer 4

Porifera

Question 5

Radially symmetrical

Answer 5

Cnidaria and Ctenophora

Question 6

Diploblastic animals with a gastrovascular cavity

Answer 6

Cnidarians

Question 7

Corrals, jellies, and hydras belong to this phylum

Answer 7

Cnidaria

Question 8

Includes flatworms with a simple NS and saclike gut

Answer 8

Acoela

Question 9

Composed of a bilateral of a few thousand cells

Answer 9

Trichoplax adhaerens

Question 10

Trichoplax adhaerens

Answer 10

Only placozoan species

Question 11

Comb jellies

Answer 11

Ctenophora

Question 12

Diploblastic, radially symmetrical animals

Answer 12

Ctenophora and Cnidaria

Question 13

Have 8 “combs” of cilia that propel them through the water

Answer 13

Ctenophora

Question 14

Compose much of the ocean’s plankton

Answer 14

Comb jellies

Question 15

Includes phyla with diverse body plans such as flatworms, molluscs, and segmented worms

Answer 15

Lophotrochozoa

Question 16

Flatworms that have bilateral symmetry and a CNS

Answer 16

Platyhelminthes

Question 17

Do not have a body cavity or circulatory organs

Answer 17

Platyhelminthes

Question 18

Tapeworms, planarians, and flukes

Answer 18

Platyhelminthes

Question 19

What are the two former phyla of Syndermata

Answer 19

Rotifers and Acanthocephalans

Question 20

Are microscopic and have complex organ systems

Answer 20

Rotifers

Question 21

Highly modified parasites of vertebrates

Answer 21

Acanthocephalans

Question 22

Bryozoans; live as sessile colonies covered by a tough exoskeleton

Answer 22

Ectoprocta

Question 23

Lamp shells; superficially resemble clams and other molluscs

Answer 23

Brachiopoda

Question 24

Most have unique stalk anchoring them to the substrate

Answer 24

Brachiopoda

Question 25

Have a crown of cilia called a lophophore

Answer 25

Brachiopoda

Question 26

Hairy bellies; tiny worms that have cilia covering their ventral surface

Answer 26

Gastrotricha

Question 27

Most species live at the bottoms of lakes or oceans

Answer 27

Gastrotricha

Question 28

(1) Symbion pandora; lives on the bodies of lobsters

Answer 28

Cycliophora

Question 29

Males impregnate females that are still developing within their mother’s bodies

Answer 29

Cycliophora

Question 30

Ribbon worms; swim or burrow in sand

Answer 30

Nemertea

Question 31

Have unique proboscis for capturing prey, an alimentary canal, and a closed circulatory system

Answer 31

Nemertea

Question 32

The coelom is reduced and the body is solid

Answer 32

Nemertea

Question 33

Most of these segmented worms live in marine or freshwater habitats

Answer 33

Annelida

Question 34

Earthworms

Answer 34

Annelida

Question 35

Have a soft body, protected by a hard shell in many species

Answer 35

Mollusca

Question 36

Snails, claims, squids, and octopi

Answer 36

Mollusca

Question 37

The phyla in this groups include more species than all other eukaryotic groups combined

Answer 37

Ecdysozoa

Question 38

Name the 5 groups of Invertebrates

Answer 38

Porifera, Cnidaria, Acoela, Placozoa, and Ctenophora

Question 39

Name the first 4 groups of Lophotrochozoa

Answer 39

Platyhelminthes, Syndermata, Ectoprocta, and Brachiopoda

Question 40

Name the 5 other groups of Lophotrochozoa

Answer 40

Gastrotricha, Cycliophora, Nemertea, Annelida, and Mollusca