Mollusca

Question 1

Mollusca habitat?

Answer 1

marine, freshwater and terrestrial

Question 2

Mollusca symmetry?

Answer 2

Bilaterally Symmetrical or asymmetrical

Question 3

Mollusca body cavity?

Answer 3

Body cavity is limited around the heart (true coelom)

Question 4

Mollusca embryonic layer?

Answer 4

Triploblastic

Question 5

Mollusc are Monoecious or Dioecious?

Answer 5

Many are dioecious, but some are monoecious

Question 6

Mollusc have A_______ T______ Larva

Answer 6

Ancestral trochophore larva (free swimming)

Question 7

Trochophore larva develops into?

Answer 7

Veliger Larva (free-swimming)

Question 8

Between mantle and visceral mass is a ________

Answer 8

Mantle cavity

Question 9

What can be found in the mantle cavity?

Answer 9

Gills and lungs

Question 10

What do mantle cavity produce?

Answer 10

Calcium carbonate (CaCO3)

Question 11

What do bivalves use for locomotion?

Answer 11

Muscular foot

Question 12

Mollusc circulatory system?

Answer 12

Open circulatory system (except for Cephalopoda)

Question 13

Mollusc excretion through kidneys called

Answer 13

metanephridia

Question 14

Mollusc Respiration through?

Answer 14

Ctenidia (marine) lungs (terrestrial)

Question 15

organ for mechanical food
processing or rasping?

Answer 15

Radula

Question 16

Radula is present in all class except?

Answer 16

Bivalves

Question 17

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

Answer 17

odontophore

Question 18

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

Answer 18

Gastropoda

Question 19

All living gastropods have undergone unique process of __________

Answer 19

Torsion

Question 20

What is torsion?

Answer 20

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.

Question 21

Gastropods have _______ body

Answer 21

Asymmetrical

Question 22

Gastropods shell are usually _______

Answer 22

coiled or uncoiled

Question 23

Right handed coil is called?

Answer 23

Dextral

Question 24

Left handed coil is called?

Answer 24

Sinistral

Question 25

Gastropods have a ____________ head

Answer 25

Well-developed

Question 26

Smallest, oldest whorl

Answer 26

Apex

Question 27

opening of shell. Where foot will exit

Answer 27

Aperture

Question 28

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

Answer 28

Operculum

Question 29

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.

Answer 29

Siphon, siphon cannal, aperture

Question 30

central axis where the whorl spiral around

Answer 30

Columella

Question 31

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

Answer 31

Pneumostome

Question 32

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

Answer 32

Osphradium, chemosensor, mechanoreceptor

Question 33

Gastropods are Monoecious or Dioecious?

Answer 33

Monoecious / Dioecious

Question 34

Larva of gastrapods are?

Answer 34

Veliger larva

Question 35

Bivalves habitat?

Answer 35

Mostly marine, others are in brackish or freshwater 

Question 36

Function of valves in bivalves?

Answer 36

a firm exoskeleton that protects the body and provide muscle attachment

Question 37

Bivalves symmetry?

Answer 37

Bilaterally Symmetrical

Question 38

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

Answer 38

Umbo

Question 39

surrounds the umbo.

Answer 39

concentric lines of growth

Question 40

Bivalves feeding habit?

Answer 40

sedentary filter feeders

Question 41

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

Answer 41

hinge ligament, dorsal, ventral

Question 42

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

Answer 42

Periostracum

Question 43

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

Answer 43

Nacreous layer

Question 44

Bivalves has no _____, no ______, and little ________

Answer 44

Head, radula, Cephalization

Question 45

serves as a spring. separates the two valves

Answer 45

Hinge ligament

Question 46

pulls the shell closed

Answer 46

anterior & posterior adductor muscles

Question 47

allows cyclic water flow throughout the mantle cavity

Answer 47

incurrent & excurrent apertures

Question 48

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

Answer 48

Mantle layer

Question 49

Gills function in bivalves?

Answer 49

allows continuous water flow through the mantle cavity helps in gathering food material

Question 50

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

Answer 50

Outer, inner, brood chamber

Question 51

Muscular foot of bivalves function?

Answer 51

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

Question 52

Gastropods have a ________ head where its eyes are on __________

Answer 52

Distinct, a pair of tentacles.

Question 53

Which aids gastropods in locomotion? present _________ the mouth

Answer 53

mucous glands, beneath

Question 54

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

Answer 54

Visceral hump

Question 55

responsible for secreting the shell in gastropoda

Answer 55

Collar

Question 56

topmost, oldest, and smallest whorl in gastropoda

Answer 56

Apex

Question 57

comprise the spire

Answer 57

Whorl

Question 58

Cephalopoda are prey or predator?

Answer 58

Predator

Question 59

Habitat of Cephalopoda?

Answer 59

All are marine

Question 60

Cephalopoda are Monoecious or Dioecious?

Answer 60

Dioecious

Question 61

Does Cephalopoda have a larval stage?

Answer 61

No. Eggs hatches as juveniles

Question 62

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

Answer 62

2 conspicuous, vertebrates, highly complex and advanced

Question 63

Cephalopoda have how many arms and tentacles?

Answer 63

8 arms. 2 tentacles

Question 64

4th pair of arms in Cephalopoda are long ___________

Answer 64

Retractile tentacles

Question 65

Tentacles and arms of Cephalopoda are merged in the ______ region

Answer 65

Head

Question 66

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

Answer 66

Funnel

Question 67

Function of siphon in Cephalopoda?

Answer 67

Excrete waste, sexual product, and ink

Question 68

Siphon is a derivative of______

Answer 68

Foot

Question 69

Male arms in Cephalopoda are _________ and _________

Answer 69

Longer and thicker

Question 70

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

Answer 70

hectocotyly

Question 71

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

Answer 71

Mouth

Question 72

The pen in Cephalopoda is composed of?

Answer 72

Chitin

Question 73

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

Answer 73

chromatophores

Question 74

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

Answer 74

Highly vascular portion (serves as respiratory chamber; lungs)

Question 75

In gastropods, second-half turn contains ________ and ________

Answer 75

Heart and a large kidney