Coelomate Invertebrates

Question 1

Coelomates have a body design that:

Answer 1

• repositions body fluid
• allows complex tissues/organs to develop
• allows larger body size

Question 2

What is second in diversity?

Answer 2

mollusks

Question 3

How are mollusks diverse?

Answer 3

• wide variety in sizes and body forms

- different environments

Question 4

What animals make up mollusks?

Answer 4

snails, slugs, clams, octopuses, and others

Question 5

How are mollusks important to humans?

Answer 5

important food source

Question 6

What are 4 classes of Mollusks?

Answer 6

• Polyplacophora
• Gastropoda
• Bivalvia
• Cephalopoda

Question 7

What does the name Polyplacophora mean?

Answer 7

many plates

Question 8

What does the name Gastropoda mean?

Answer 8

stomach foot

Question 9

What does the name Bivalvia mean?

Answer 9

two shells

Question 10

What does the name Cephalopdoa mean?

Answer 10

head foot

Question 11

What is the phylum name for Mollusks?

Answer 11

Mollusca

Question 12

What type of symmetry do mollusks have?

Answer 12

bilaterall

Question 13

What is reduced in mollusks? What does it surround?

Answer 13

they have a reduced coelom surrounding the heart and excretory organs

Question 14

Where are organs located in mollusks?

Answer 14

visceral mass

Question 15

What is a visceral mass?

Answer 15

core parts of animal’s body where organs are located

Question 16

How are mollusks’ head?

Answer 16

may have a differentiated head at the anterior end of the body

Question 17

What allows for complex organisms?

Answer 17

having a coelomic cavity

Question 18

What covers the Mollusks body?

Answer 18

mantle

Question 19

What is a mantle?

Answer 19

a thick epidermis that covers the dorsal side of the body that houses organs

Question 20

What organs does the mantle house?

Answer 20

respiratory, excretory, reproductive, and digestive

Question 21

What respiratory organs do aquatic mollusks have?

Answer 21

ctenidia (gills)

Question 22

What is the function of the foot of a mollusk?

Answer 22

locomotion, attachment, and food capture (not all use it for food capture)

Question 23

What is the shell of a mollusk secreted from?

Answer 23

mantle tissue

Question 24

Do all mollusks have an exterior shell?

Answer 24

no, some have interior and some have none at all

Question 25

What are shells made of?

Answer 25

calcium, carbonate rich

Question 26

What is the function of a shell?

Answer 26

protection

Question 27

How do mollusks remove waste?

Answer 27

Nephridia

Question 28

What is nephridia?

Answer 28

special excretory structures that remove nitrogenous wastes

Question 29

What type of circulatory system do mollusks have?

Answer 29

all except Cephalopods have an open circulatory system, they have a closed

Question 30

What is an open circulatory system?

Answer 30

-blood is contained in connected chambers surrounding various organs instead of within blood vessels

Question 31

What is a closed circulatory system?

Answer 31

blood is contained within the blood vessels

Question 32

What allows cephalopods to move fast?

Answer 32

efficiency of a closed circulatory system

Question 33

What allows organisms to be large?

Answer 33

closed circulatory system

Question 34

Are mollusks sex separated or hermaphroditic?

Answer 34

distinct male and female individuals in most

Question 35

What type of fertilization do mollusks do?

Answer 35

external

Question 36

What are mollusk larvae like?

Answer 36

free-swimming

Question 37

What animal are class Polyplacophora?

Answer 37

Chitons

Question 38

What do Polyplacophora look like?

Answer 38

oval bodies, eight overlapping dorsal calcareous plates

Question 39

Are Polyplacophora segmented?

Answer 39

no

Question 40

What diet do Polyplacophora have?

Answer 40

grazing herbivores

Question 41

How do Polyplacophora plates move?

Answer 41

having multiple plates allows the body to curve to match rock

Question 42

What is the function of the shell of Polyplacophora?

Answer 42

protects the Chiton from drying out when exposed to dry air

Question 43

What are the "teeth" of Polyplacophora called?

Answer 43

radula, used for scraping

Question 44

What animal are class Gastropoda?

Answer 44

snails and slugs

Question 45

What are Gastropoda eyes like?

Answer 45

tentacles with eyes

Question 46

Can Gastropods see?

Answer 46

can see images (not well)

Question 47

How do snails embryologically develop?

Answer 47

- torsion | - coiling

Question 48

What is torsion?

Answer 48

mantle and anus cavity move from the posterior to the front because it rotates during embryonic development (counter clockwise rotation)

Question 49

What is coiling?

Answer 49

spiral winding of the shell

Question 50

What animals are under class Bivalvia?

Answer 50

clams, scallops, mussels, oysters, and others

Question 51

What is the body of a Bivalvia like?

Answer 51

2 lateral (right and left) shells (valves) hinged together dorsally

Question 52

How do Bivalves eat?

Answer 52

sessile filter-feeders, siphon water across gills

Question 53

What does sessile mean?

Answer 53

fixed in one place

Question 54

Do Bivalvia move?

Answer 54

some can. Clams can dig with foot and move on sand, all move as larvae

Question 55

Are Cephalopods prey or predators?

Answer 55

active marine predators

Question 56

What do Cephalopods body look like?

Answer 56

series of arms with suction cups

Question 57

How are Cephalopods advanced?

Answer 57

have highly developed nervous system

Question 58

How is the Cephalopod nervous system highly developed?

Answer 58

they exhibit complex patterns of behavior and high level of intelligence