Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Zoo Lec > Module 4 Annelida > Flashcards

Module 4 Annelida Flashcards

1
Q

They are segmented worms, have a trochophore larva (Lophotrochozoan), found in marine, freshwater,
and moist terrestrial habitats.

A

Annelida

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

They exhibit true segmentation or metamerism

A

Annelida

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What do segments do?

A

The segments (annuli)
contain repeated external
and internal morphological
features. Segments work together for
the whole organism.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

True or False: In most species (except leeches),
each segment has chitinous extensions called chaetae/setae
that aid in movement.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What does each segment of an Annelida have that aid in movement?

A

They have chitinous extensions called Chaetae/setae

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What do short satae/chaetae segments do?

A

Short setae anchor
segments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What do long satae do?

A

long setae aid in
swimming in aquatic forms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

True or False: Typical annelids have a 2 part
head, a segmented body, and a
terminal portion

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Terminal portion of an annelid is called?

A

Pygmidium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Parts of the head of an annelid

A

prostomium and
peristomium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

This part of an annelid contains the anus

A

Pygmidium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

True or False: The head and pygmidium are
not considered segments

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Where are older segments found?

A

Older segments are found in the
anterior end.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

True or false: All annelids have a true coelom

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

True or false: Annelids’ coelom forms via schizocoely

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

True or False: Coelom is composed of
paired compartments in
each segment

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Partitions are called?

A

Septa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the function of a septa

A

Septa prevent
movement of fluids
between segments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

True or False: Body wall surrounding the coelom is lined with circular and
longitudinal muscles

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How do annelids move?

A

Annelids move by
producing alternating
waves of contraction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

True or False: Most annelids (except leeches)
have a fluid filled coelom that serves as a hydrostatic skeleton

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

True or False: Annelids have a complete
digestive system with
specialized organs

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

A ________ facilitate excretion in Annelids

A

A pair of nephridia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

True or False: Gas exchange is either
through skin, gills, or
parapodia

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Annelids have a _________
circulatory system

A

Closed circulatory system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

True or False: Annelids have a closed
circulatory system with
aortic arches (“hearts”)
for pumping blood

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

True or False: Nervous system of an annelid is well-developed with 2 ventral nerve cords and a nerve
ring around the pharynx

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

True or False: Nervous system of an annelid has a double ventral nerve cord and paired
ganglia

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

_______ of an annelid is made up of a pair of dorsal ganglia

A

Brain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

True or False: Annelids are either
monoecious or dioecious

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

_________ annelids
have permanent
gonads

A

Monoecious

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

______ annelids have temporary
gonads

A

Dioecious

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

In annelid, asexual reproduction occurs via?

A

Asexual reproduction occurs via
fission and fragmentation (Capable of complete
regeneration)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

3 historical classes of Annelids

A

Polychaeta, Oligochaeta, Hirudinea

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Two historical class of annelid that are paraphyletic

A

Polychaeta and Oligochaeta

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

_____ is used as a
descriptive term to refer to annelids with many setae

A

Polychaete

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

Modern molecular phylogeny
supports what 2 main groups
containing most annelids:

A

Sedentaria and Errantia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

Mostly marine and have multiple setae per
segment

A

Errant polychaetes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Each segment has
paired, fleshy
appendages called ?

A

Parapodia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

These are the primary
respiratory organs of an Errantia

A

Parapodia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

True or false: Some errantia have gills while some have parapodia

42
Q

True or False: Errantia are usually predators or scavengers

43
Q

True or False: The Sensory organs of Errentia are highly developed

44
Q

Why are sensory organs of Errentia highly developed?

A

Because their eyes range from simple eyespots to well-developed
eyes

45
Q

True or False: Errentia have no permanent sex organs

46
Q

True or False: Gonads are temporary swellings of the peritoneum
and gametes are shed into the coelom

47
Q

True or False: Fertilization is external in Errentia

48
Q

Contains sedentary polychaetes
and oligochaetes that live in tubes or burrows. It also includes clade Clitellata based on molecular data

A

Sedentaria

49
Q

True or False: Body plan of Sedentaria is similar to Errantia,
but with tentacles around the head for feeding

50
Q

They are small and are
sometimes used to anchor the
worm

51
Q

Earthworms and
relatives (Oligochaeta)
and leeches (Hirudinea). Have fewer, reduced chaetae or no chaetae

A

Clade Clitellata

52
Q

True or False: Clade Clitellata contain a clitellum.

53
Q

Where is clitellum always visible?

A

The clitellum is
always visible in
mature oligochaetes but is only visible in
leeches during mating
season

54
Q

This is a ring structure in the skin that secretes
mucus for reproduction

55
Q

True or False: All Clade Clitellata are monoecious

56
Q

True or false: Development in a Clade Clitellata is direct

57
Q

Why is development direct in Clade Clitellata?

A

Young develop
inside a cocoon
secreted by the
clitellum and
emerge

58
Q

True or False: Trochophore is
not visible during the development

59
Q

These are paraphyletic, most are terrestrial or
freshwater with a few parasitic,
marine, and brackish forms, and setae are less numerous than in
polychaetes.

A

Oligochaetes

60
Q

True or False: Aquatic worms have longer
setae

61
Q

True or False: Oligochaetes have typical annelid body
plan other than
digestive and nervous
systems and these Lack parapodia (Setae extend
directly from the
body wall)

62
Q

True or False: Most are scavengers in Oligochaetes

A

True (Earthworms feed on decaying organic
matter)

63
Q

This is along
the esophagus that reduce the concentration of calcium ions in the blood and regulate acid-base balance

A

Calciferous glands

64
Q

Where is food stored in Oligochaetes?

A

Food is stored in the crop then passed on to the gizzard for
grinding into small pieces

65
Q

True or False: In Oligochaetes, Digestion and absorption occur
in the small intestine

66
Q

A dorsal infolding of the intestine that increases surface area

A

Typhlosole

67
Q

True or False: In the circulation and respiration of Earthworms, they have double transport system carries food, waste, and
gases:

68
Q

True or False: The blood contains
hemoglobin in
some species of Earthworms

69
Q

True or False: In Earthworms, gas exchange is cutaneous

70
Q

In excretion, each segment contains paired metanephridia except?

A

Except for the
first 3 segments and the final segment

71
Q

What do Aquatic oligochaetes excrete?

A

Aquatic oligochaetes
excrete ammonia

72
Q

What do terrestrial polychaetes
excrete?

A

terrestrial polychaetes
excrete urea

73
Q

True or false: In Earthworms, they have typical annelid nervous
system

74
Q

Most have large axons called ________ that have
increased rates of
conduction

A

Giant axons

75
Q

True or False: In Earthworms/Oligochaete, sense organs are distributed all over the body

76
Q

True or False: Earthworms have no eyes

77
Q

True or False: Earthworms primarily rely
on chemical and tactile
signals

78
Q

True or False: Earthworms have some
learning ability

79
Q

True or false: Earthworms are monoecious

80
Q

What keep the worms together during reproduction?

A

Mucus from the clitellum

81
Q

What helps penetration during reproduction

A

Modified setae

82
Q

True or False: Earthworms are beneficial to the
soil

83
Q

True or False: Earthworm activity mixes
topsoil and subsoil

84
Q

Earthworms are the
“_____ of the soil”

A

Intestines of the soil

85
Q

True or False: When earthworms
ingest soil, they add
nitrogenous products

86
Q

True leeches, Completely lack setae, Have exactly 34 segments, Mostly freshwater, many are carnivores, some are
parasites

A

Order Hirudinea

87
Q

True or false: Leeches have no distinct
coelomic compartments

88
Q

True or False: in Order Hirudinea, Coelom is reduced

89
Q

Since coelom is reduced, Coelom is filled with
connective tissue and a
system of spaces called

90
Q

True or False: Most freshwater leeches are
predators or scavengers

91
Q

True or False: Leeches feed on fluids

A

True (Many prefer tissue
fluids and blood from
open wounds)

92
Q

True or False: True bloodsuckers have
chitinous “jaws” for cutting skin

93
Q

True or false: In Leeches, Salivary glands secrete
an anaesthetic and
anticoagulants

94
Q

How are leeches traditionally used?

A

Leeches were used traditionally
for bloodletting throughout
history

95
Q

Leeches are used in modern
medicine as well, how?

A

Leeches are used to relieve
congestion in reattached
appendages while the blood
vessels heal

96
Q

True or False: Leeches have “2 brains”

97
Q

How many pairs do Anterior and Posterior ends have?

A

Anterior : 6 pairs fused
ganglia
Posterior: 7 pairs

98
Q

True or false: Leeches are monoecious

99
Q

In leeches, this occurs during mating.

A

Cross-fertilization
occurs during mating

100
Q

How is sperm transferred?

A

Sperm is transferred by
hypodermic
impregnation

101
Q

True or False: Some retain an oligochaete
circulatory system while other lack traditional blood
vessels and rely on the coelomic sinuses

Zoo Lec (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions