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Bomboclatt > Phylum Mollusca > Flashcards

Phylum Mollusca Flashcards

1
Q

What is the primary method of excretion in Phylum Mollusca?

A

Nephridia

Metabolic waste leaves through a pore into the mantle cavity and gets washed away.

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2
Q

What type of fertilization occurs in terrestrial mollusks and cephalopods?

A

Internal fertilization

Most mollusks have separate sexes, except for some hermaphroditic species like snails and slugs.

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3
Q

What is the larval stage of mollusks called?

A

Trochophore larva

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4
Q

What type of circulatory system do most fast-moving mollusks, such as cephalopods, have?

A

Closed circulatory system

In a closed circulatory system, blood is contained in vessels at all times.

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5
Q

What is the main function of gills in mollusks?

A

Gas exchange

Most gas exchange occurs with gills located within the mantle.

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6
Q

What structure do all mollusks, except bivalves, possess for feeding?

A

Radula

The radula is a rasping tongue with tiny teeth used for scraping food into the mouth.

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7
Q

Which class of mollusks is characterized by having ‘2 valves (shells)’?

A

Class Bivalvia

Examples include clams, oysters, scallops, and mussels.

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8
Q

What is the main role of mollusks in the environment?

A

Important source of food for organisms including humans

They also serve as hosts for many parasites and environmental monitors of ocean water.

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9
Q

What type of nervous system do most mollusks have?

A

Mainly simple nervous system

This includes ganglia and nerve cords, with most having simple eyes.

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10
Q

What are the five main parts of the general body plan of mollusks?

A
  • Head
  • Foot
  • Mantle
  • Visceral mass
  • Shell
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11
Q

What is the meaning of the name ‘mollusca’?

A

Soft-bodied animals

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12
Q

Fill in the blank: The shell of a mollusk can be _______ or reduced.

A

absent

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13
Q

What type of symmetry do mollusks exhibit?

A

Bilateral symmetry

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14
Q

What are the three main layers of cells in coelomate mollusks?

A
  • Ectoderm
  • Mesoderm
  • Endoderm
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15
Q

What is a notable feature of the nervous system in cephalopods?

A

Well-developed brain

Cephalopods have a complex nervous system with advanced sensory capabilities.

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16
Q

What do bivalves primarily use for feeding?

A

Filter feeding using their gills

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17
Q

True or False: All mollusks have an external shell.

A

False

The shell can be absent or reduced in some species.

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18
Q

Which class of mollusks includes squids and octopuses?

A

Class Cephalopoda

This class is characterized as ‘head foot’.

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19
Q

What is the primary habitat of most mollusks?

A

Mainly aquatic, some terrestrial

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20
Q

What adaptation do terrestrial mollusks like snails and slugs require?

A

Moist environments

The thin membrane around their mantle cavity acts as a primitive lung.

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21
Q

What the habitat of phylum mollusca?

A

Mainly aquatic, some terrestial

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22
Q

What are examples of Phylum mollusca?

A

clams, oysters, snails, slugs, squid, octopus

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23
Q

How many cell layers?

A

Coelomate 3 cell layers

24
Q

What does trochophore larvae mean (which all of them have)

A

free swimming larvae with lots of cilia

25
Q

What does trochophore larvae mean (which all of them have)

A

free swimming larvae with lots of cilia

26
Q

facts about the head

A
  • absent in some bivalves
  • Where the mouth and sensory organs are located
27
Q

facts about the foot

A
  • muscular, mainly for locomotion
  • In squid/octopus, their foot is modified into tentacles
28
Q

facts about the mantle

A
  • thin tissue layer that surrounds the body.
  • The mantle also helps create their shell
29
Q

facts about the visceral mass

A

soft portion, contains internal organs

30
Q

facts about the shell

A
  • absent or reduced in some
  • The shell can be internal or external
    ーThe shell is used for protection
    Made from glands that secrete CaCO3
31
Q

Three facts about cephalopods nervous system

A
  • Have a well-developed brain
  • Complex nervous system
  • Eyes for sight
32
Q

Three facts about cephalopods nervous system

A
  • Have a well-developed brain
  • Complex nervous system
  • Eyes for sight
33
Q

four ways these creatures fit into this world

A
  • Important source of food for organisms including humans
  • Serve as hosts for many parasites
  • Environmental monitors of ocean water
  • Snails and slugs may cause crop damage
34
Q

Class Bivalvia definition and examples

A

2 valves (shells)” ex. Clams, oysters, scallops, mussels

35
Q

Class gastropoda definition and examples

A

Stomach foot” ex. Slugs, snails, nudibranchs, abalone

36
Q

Class Cephalopoda definition and examples

A

Head foot” ex. Squid, octopus, cuttlefish, nautilus

37
Q

All mollusc except bivalves have a …

A

radula

38
Q

whats a radula

A

a rasping tongue with tiny teeth for scraping food into mouth (like sandpaper)

39
Q

Bivalves filter feed using what

A

their gills

40
Q

Cephalopods use what for feeding and digestion

A

a beak and radula

41
Q

Complete digestive tract goes from what to what

A

mouth to anus

42
Q

How is gas exchanged by in respiration

A

with gills within the mantle

43
Q

Terrestrial mollusc such as snails and slugs require what environments

A

moist environments

44
Q

in resporation The thin membrane around their mantle cavity acts as what

A

a primitive lung

45
Q

Open circulatory systems are common in who

A

Common in slow moving, sessile mollusc: bivalves and gastropods

46
Q

Closed circulatory systems are common in who

A

Common in fast moving mollusc: cephalopods

47
Q

Most have what kind of heart in internal transportation?

A

a chambered heart

48
Q

what happens in an open circulatory system?

A

Blood bathes the tissues rather than directly delivered by blood vessels and it’s not contained in the vessels at all times

49
Q

How does waste leave

A

Leaves through a pore into the mantle cavity and gets washed away

50
Q

What creature changes genders

A

oysters

51
Q

internal fertilization happens in who

A

terrestial molluscs and cephalopods

52
Q

Which two are hermaphodites

A

snails and slugs

53
Q

what kinda fertilization

A

external fertilization

54
Q

In reproduction the sexes are mostly

A

seperate sexes

55
Q

In reproduction the sexes are mostly

A

seperate sexes

Bomboclatt (1 decks)

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