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ZOO 116 > PHYLUM PORIFERA > Flashcards

PHYLUM PORIFERA Flashcards

Characteristics, classes and orders

1
Q

Poriferans are exclusively aquatic and mostly marine except

A

Spongillidae(found in freshwater)

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2
Q

Another feature of phylum porifera is that

A

They are multicellular in the cellular level of organization

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3
Q

Porifera have no distinct …. and ……

A

tissues and organs.

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4
Q

What is the shape of a porifera

A

Vase-like or cylindrical

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5
Q

Porifera are sessile, sedentary and grow like plants means that

A

They do not move from one place to another

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6
Q

Porifera have both male and female sexual organs and are

A

Monoecious

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7
Q

Sexual reproduction in porifera takes place by

A

Ova and sperm

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8
Q

Asexual reproduction takes place by

A

Buds and gemmules

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9
Q

Porifera have body perforate by pores . Water enters through the ….. and leaves through the ….

A

Ostia and oscula.

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10
Q

They internal space of a sponge is called

A

Spongocoel

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11
Q

The layers of a poriferans body are

A

Ectoderm, endoderm and intermediate mesenchyme.

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12
Q

Poriferans are

A

Diploblastic

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13
Q

The classes of poriferans are

A

Calcarea(calcispongiae),hexactinellida( hyalospongiae) and demospongiae

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14
Q

There is no ……. And digestion is intracellular

A

Cytostome

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15
Q

,……… and ……….systems are absent in a porifera

A

Excretory and respiratory

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16
Q

Some freshwater forms have

A

Contractile vacoules

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17
Q

The orders of calcarea are

A

Homocoela and heterocoela

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18
Q

The orders of hexactinellida are

A

Hexasterospora and amphidiscophora

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19
Q

Another name for homocoela is

A

Asconosa

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20
Q

Another name for heterocoela is

A

Syncomosa

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21
Q

…… and …… Are examples of heterocoela

A

Grantia and sychon(scypha)

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22
Q

,…….. and ……. are examples of homocoela

A

Leucosolenia and clathrina

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23
Q

Homocoela have spongocoel lined with

A

Choanocytes

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24
Q

The body wall of homocoela are

A

Thin and unfolded

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25
Q

The body wall of homocoela are

A

Thin and unfolded

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26
Q

The body wall of heterocoela are

A

Thick and folded

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27
Q

The choanocytes in heterocoela are found in……. Chambers ie …….. cells

A

Flagellated chambers I. E radial cells

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28
Q

Hyalospongiae are called glass sponges because

A

They have no epidermal epithelium

29
Q

Hexactinellida is also known as

A

Hyalospongiae

30
Q

Hyalospongiae which are directly attached to the substratum are called …..

A

Hexaterospora

31
Q

Hexasteroporans are called …….. due to ..,…… shape with axes ending in

A

Hesxasters due to star-like shape with aces ending in rays

32
Q

Hexasteroporans are called …….. due to …… shape with axes ending in

A

Hesxasters due to star-like shape with aces ending in rays

33
Q

Examples of hexasters are

A

Euplectella and farnera

34
Q

Examples of hexasters are

A

Euplectella and farnera

35
Q

Amphidiscophora is an order of the class

A

Hyalospongiae

36
Q

Examples of amphidiscophora are

A

Hyalonema and pheronema

37
Q

Amphidiscophora are attached to the substratum by

38
Q

The amphidisc is convex and has a posteriorly -directed …….at both ends

A

Marginal tooth

39
Q

Hexactinellida have …….spicules that are……. with …… rays

A

Siliceous, triaxon, 6

40
Q

Choanocytes in hyalospongiae line ……… cells

A

Finger-like cells

41
Q

Function of choanocytes are represented by the mnemonic

42
Q

Function of archeocytes include

A

Digestion of food
Storage of digested food
Elimination of waste

43
Q

Function of water include

A

System of gas exchange
Source of food
Removal of waste
Gamete transfer

44
Q

Sponges are…. in body plan

A

Asymmetrical or radially symmetrical

45
Q

Sponges don’t have. .

46
Q

Skeleton is made up of

A

Spongin fibers, calcareous or siliceous

47
Q

Another name for archeocytes is

A

Amoebocytes

48
Q

Mesohyl of sponges is made up of

A

Supporting elements called spicules and amobeocytes

49
Q

The …..transverses the spongocoel

50
Q

Spongin fibers are secreted by

A

Spongocytes

51
Q

Calcareous and silicious spicules are secreted by

A

Sclerocytes

52
Q

…… is composed of archeocytes cluster surrounded by capsule

53
Q

Sexual reproduction takes place by gamete formation in the

54
Q

Archeocytes give rise to……

A

Male and female gametes

55
Q

…….. extends through the body wall to form ostia

56
Q

Embryonic development leads to the formation of

A

Flagellated parenchymula and amphiblastula larvae

57
Q

Proiferan exists in3 forms namely

A

Asconoid, synconoid and leuconoid

58
Q

I’m ascomoids, the Ostia is represented by

A

Intracellular canals

59
Q

On synconoid, invaginations are called …. , Evagknatioms are called

A

Incurrent canals, excurrent canals

60
Q

The Ostia in sycon is between

A

Incurrent canal and radial canal

61
Q

Leucons have many…. And an ….. Shape

A

Osculum and irregular

62
Q

Leucon attain greatest size by

A

Formation of many chambers

63
Q

An example of sycon is

64
Q

Body form of demospongiae is….. With….. Symmetry

A

Leuconoid, irregular

65
Q

……. have siliceous spicules and spongin fibers enclosed in CaCO3

A

Sclerospongiae (leuconoid)

66
Q

Examples of demospongiae are

A

Cliona and spongilla

67
Q

Archeocytes are called amoebocytes because

A

They can move and change into other sponge cells

68
Q

Choanocytes possess

ZOO 116 (9 decks)

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