PHYLUM PORIFERA

Question 1

Poriferans are exclusively aquatic and mostly marine except

Answer 1

Spongillidae(found in freshwater)

Question 2

Another feature of phylum porifera is that

Answer 2

They are multicellular in the cellular level of organization

Question 3

Porifera have no distinct …. and ……

Answer 3

tissues and organs.

Question 4

What is the shape of a porifera

Answer 4

Vase-like or cylindrical

Question 5

Porifera are sessile, sedentary and grow like plants means that

Answer 5

They do not move from one place to another

Question 6

Porifera have both male and female sexual organs and are

Answer 6

Monoecious

Question 7

Sexual reproduction in porifera takes place by

Answer 7

Ova and sperm

Question 8

Asexual reproduction takes place by

Answer 8

Buds and gemmules

Question 9

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

Answer 9

Ostia and oscula.

Question 10

They internal space of a sponge is called

Answer 10

Spongocoel

Question 11

The layers of a poriferans body are

Answer 11

Ectoderm, endoderm and intermediate mesenchyme.

Question 12

Poriferans are

Answer 12

Diploblastic

Question 13

The classes of poriferans are

Answer 13

Calcarea(calcispongiae),hexactinellida( hyalospongiae) and demospongiae

Question 14

There is no ……. And digestion is intracellular

Answer 14

Cytostome

Question 15

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

Answer 15

Excretory and respiratory

Question 16

Some freshwater forms have

Answer 16

Contractile vacoules

Question 17

The orders of calcarea are

Answer 17

Homocoela and heterocoela

Question 18

The orders of hexactinellida are

Answer 18

Hexasterospora and amphidiscophora

Question 19

Another name for homocoela is

Answer 19

Asconosa

Question 20

Another name for heterocoela is

Answer 20

Syncomosa

Question 21

…… and …… Are examples of heterocoela

Answer 21

Grantia and sychon(scypha)

Question 22

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

Answer 22

Leucosolenia and clathrina

Question 23

Homocoela have spongocoel lined with

Answer 23

Choanocytes

Question 24

The body wall of homocoela are

Answer 24

Thin and unfolded

Question 25

The body wall of homocoela are

Answer 25

Thin and unfolded

Question 26

The body wall of heterocoela are

Answer 26

Thick and folded

Question 27

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

Answer 27

Flagellated chambers I. E radial cells

Question 28

Hyalospongiae are called glass sponges because

Answer 28

They have no epidermal epithelium

Question 29

Hexactinellida is also known as

Answer 29

Hyalospongiae

Question 30

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

Answer 30

Hexaterospora

Question 31

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

Answer 31

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

Question 32

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

Answer 32

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

Question 33

Examples of hexasters are

Answer 33

Euplectella and farnera

Question 34

Examples of hexasters are

Answer 34

Euplectella and farnera

Question 35

Amphidiscophora is an order of the class

Answer 35

Hyalospongiae

Question 36

Examples of amphidiscophora are

Answer 36

Hyalonema and pheronema

Question 37

Amphidiscophora are attached to the substratum by

Answer 37

Tufts

Question 38

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

Answer 38

Marginal tooth

Question 39

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

Answer 39

Siliceous, triaxon, 6

Question 40

Choanocytes in hyalospongiae line ......... cells

Answer 40

Finger-like cells

Question 41

Function of choanocytes are represented by the mnemonic

Answer 41

GCC

Question 42

Function of archeocytes include

Answer 42

Digestion of food Storage of digested food Elimination of waste

Question 43

Function of water include

Answer 43

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

Question 44

Sponges are.... in body plan

Answer 44

Asymmetrical or radially symmetrical

Question 45

Sponges don't have. .

Answer 45

Cytostome

Question 46

Skeleton is made up of

Answer 46

Spongin fibers, calcareous or siliceous

Question 47

Another name for archeocytes is

Answer 47

Amoebocytes

Question 48

Mesohyl of sponges is made up of

Answer 48

Supporting elements called spicules and amobeocytes

Question 49

The .....transverses the spongocoel

Answer 49

Porocytes

Question 50

Spongin fibers are secreted by

Answer 50

Spongocytes

Question 51

Calcareous and silicious spicules are secreted by

Answer 51

Sclerocytes

Question 52

...... is composed of archeocytes cluster surrounded by capsule

Answer 52

Gemmule

Question 53

Sexual reproduction takes place by gamete formation in the

Answer 53

Mesohyl

Question 54

Archeocytes give rise to......

Answer 54

Male and female gametes

Question 55

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

Answer 55

Porocytes

Question 56

Embryonic development leads to the formation of

Answer 56

Flagellated parenchymula and amphiblastula larvae

Question 57

Proiferan exists in3 forms namely

Answer 57

Asconoid, synconoid and leuconoid

Question 58

I'm ascomoids, the Ostia is represented by

Answer 58

Intracellular canals

Question 59

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

Answer 59

Incurrent canals, excurrent canals

Question 60

The Ostia in sycon is between

Answer 60

Incurrent canal and radial canal

Question 61

Leucons have many.... And an ..... Shape

Answer 61

Osculum and irregular

Question 62

Leucon attain greatest size by

Answer 62

Formation of many chambers

Question 63

An example of sycon is

Answer 63

Scypha

Question 64

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

Answer 64

Leuconoid, irregular

Question 65

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

Answer 65

Sclerospongiae (leuconoid)

Question 66

Examples of demospongiae are

Answer 66

Cliona and spongilla

Question 67

Archeocytes are called amoebocytes because

Answer 67

They can move and change into other sponge cells

Question 68

Choanocytes possess

Answer 68

Flagella