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ZOOLOGY > Mollusca > Flashcards

Mollusca Flashcards

1
Q

Mollusca habitat?

A

marine, freshwater and terrestrial

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2
Q

Mollusca symmetry?

A

Bilaterally Symmetrical or asymmetrical

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3
Q

Mollusca body cavity?

A

Body cavity is limited around the heart (true coelom)

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4
Q

Mollusca embryonic layer?

A

Triploblastic

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5
Q

Mollusc are Monoecious or Dioecious?

A

Many are dioecious, but some are monoecious

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6
Q

Mollusc have A_______ T______ Larva

A

Ancestral trochophore larva (free swimming)

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7
Q

Trochophore larva develops into?

A

Veliger Larva (free-swimming)

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8
Q

Between mantle and visceral mass is a ________

A

Mantle cavity

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9
Q

What can be found in the mantle cavity?

A

Gills and lungs

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10
Q

What do mantle cavity produce?

A

Calcium carbonate (CaCO3)

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11
Q

What do bivalves use for locomotion?

A

Muscular foot

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12
Q

Mollusc circulatory system?

A

Open circulatory system (except for Cephalopoda)

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13
Q

Mollusc excretion through kidneys called

A

metanephridia

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14
Q

Mollusc Respiration through?

A

Ctenidia (marine) lungs (terrestrial)

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15
Q

organ for mechanical food
processing or rasping?

A

Radula

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16
Q

Radula is present in all class except?

A

Bivalves

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17
Q

Radula is supported by a cartilage which moves in and out the buccal cavity is called

A

odontophore

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18
Q

What is the largest, most successful, most diverse class?

A

Gastropoda

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19
Q

All living gastropods have undergone unique process of __________

A

Torsion

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20
Q

What is torsion?

A

the rotation of the visceral mass, mantle, and shell 180˚ counterclockwise with respect to the head and foot of the gastropod. This rotation brings the mantle cavity and the anus to an anterior position above the head.

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21
Q

Gastropods have _______ body

A

Asymmetrical

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22
Q

Gastropods shell are usually _______

A

coiled or uncoiled

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23
Q

Right handed coil is called?

A

Dextral

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24
Q

Left handed coil is called?

A

Sinistral

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25
Q

Gastropods have a ____________ head

A

Well-developed

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26
Q

Smallest, oldest whorl

A

Apex

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27
Q

opening of shell. Where foot will exit

A

Aperture

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28
Q

“trapdoor” to close the aperture of the shell when the soft parts of the animal are retracted

A

Operculum

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29
Q

Many snails possess a ________, a snorkel that sticks out into the water through a _________, seen in the ________ in the shell. They use the siphon to bring water in over their gills and also to taste the water.

A

Siphon, siphon cannal, aperture

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30
Q

central axis where the whorl spiral around

A

Columella

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31
Q

In gastropods, lung open to the outside by a small opening (pore) called _________

A

Pneumostome

32
Q

Located at the base of the incurrent siphon of gastropods is a sensory area called ________. Which is a ________ or ________

A

Osphradium, chemosensor, mechanoreceptor

33
Q

Gastropods are Monoecious or Dioecious?

A

Monoecious / Dioecious

34
Q

Larva of gastrapods are?

A

Veliger larva

35
Q

Bivalves habitat?

A

Mostly marine, others are in brackish or freshwater

36
Q

Function of valves in bivalves?

A

a firm exoskeleton that protects the body and provide muscle attachment

37
Q

Bivalves symmetry?

A

Bilaterally Symmetrical

38
Q

swollen hump; oldest and thickest
part of the shell in bivalves

A

Umbo

39
Q

surrounds the umbo.

A

concentric lines of growth

40
Q

Bivalves feeding habit?

A

sedentary filter feeders

41
Q

valves are attached together by the
_____________ on the ________ side. _______ side is free to allow the protrusion of the foot

A

hinge ligament, dorsal, ventral

42
Q

outer, rigid, and horny layer of the bivalves shell; it protects the underlying CaCO3 from dissolving by acids in the waters.

A

Periostracum

43
Q

inner, shiny layer in bivalves that lies next to the mantle which is secreted continuously by the mantle surface

A

Nacreous layer

44
Q

Bivalves has no _____, no ______, and little ________

A

Head, radula, Cephalization

45
Q

serves as a spring. separates the two
valves

A

Hinge ligament

46
Q

pulls the shell closed

A

anterior & posterior adductor muscles

47
Q

allows cyclic water flow throughout the mantle cavity

A

incurrent & excurrent apertures

48
Q

surrounds the entire viscera. And upon lifting, exposes the outer gills

A

Mantle layer

49
Q

Gills function in bivalves?

A

allows continuous water flow through
the mantle cavity

helps in gathering food material

50
Q

In female bivalves, the ______ gill is thicker than the ______ gill. The former serves as a ___________ for offspring

A

Outer, inner, brood chamber

51
Q

Muscular foot of bivalves function?

A

For locomotion and anchoring (pumps blood into the foot, causes it to swell and anchor itself on soft surfaces)

52
Q

Gastropods have a ________ head where its eyes are on __________

A

Distinct, a pair of tentacles.

53
Q

Which aids gastropods in locomotion? present _________ the mouth

A

mucous glands, beneath

54
Q

In gastropoda, its visceral mass that is coiled inside the shell. it is covered by a thin mantle. thickens to form the collar

contains most of the organs, including a complete digestive and excretory tract as well as the reproductive organs

A

Visceral hump

55
Q

responsible for secreting the shell in gastropoda

A

Collar

56
Q

topmost, oldest, and smallest whorl in gastropoda

A

Apex

57
Q

comprise the spire

A

Whorl

58
Q

Cephalopoda are prey or predator?

A

Predator

59
Q

Habitat of Cephalopoda?

A

All are marine

60
Q

Cephalopoda are Monoecious or Dioecious?

A

Dioecious

61
Q

Does Cephalopoda have a larval stage?

A

No. Eggs hatches as juveniles

62
Q

Cephalopoda have _________ eyes. That are similar to ________. And are _________ and ________

A

2 conspicuous, vertebrates, highly complex and advanced

63
Q

Cephalopoda have how many arms and tentacles?

A

8 arms. 2 tentacles

64
Q

4th pair of arms in Cephalopoda are long ___________

A

Retractile tentacles

65
Q

Tentacles and arms of Cephalopoda are merged in the ______ region

A

Head

66
Q

In Cephalopoda, expels water from the mantle cavity and allows it to move swiftly

A

Funnel

67
Q

Function of siphon in Cephalopoda?

A

Excrete waste, sexual product, and ink

68
Q

Siphon is a derivative of______

A

Foot

69
Q

Male arms in Cephalopoda are _________ and _________

A

Longer and thicker

70
Q

In Cephalopoda, it is a process that allows the 4th arm of the mature male to become modified for the transfer of sperm cells to the female

A

hectocotyly

71
Q

In Cephalopoda, it is surrounded by a buccal membrane with seven projections

A

Mouth

72
Q

The pen in Cephalopoda is composed of?

A

Chitin

73
Q

In Cephalopoda, it causes spotted
skin, also known as pigment cells, which allows it to change color

A

chromatophores

74
Q

In gastropods, first-half turn of the spiral contains the _________

A

Highly vascular portion (serves as respiratory chamber; lungs)

75
Q

In gastropods, second-half turn contains ________ and ________

A

Heart and a large kidney

ZOOLOGY (4 decks)

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