PORIFERA

Question 1

invertebrates constitute how much of animal specie

Answer 1

95%

Question 2

invertebrates have been divided into how many phyla

Answer 2

eight

porifera, annelida, molluscs, flatworms, echinodermata,round worms ,

Question 3

porifera means

Answer 3

pore bearer

Question 4

which organization is missing in porifera
a. tissue
b. organ
c. organ system
d.all

Answer 4

ALL of these

mutlicellular organisms- lack tissue organizaqtion and obv the rest as w

Question 5

mode of life of porifera

Answer 5

sessile- adults

attached to rocks at the bottom of the sea- larva; stages are motile

Question 6

habitat

Answer 6

aquatic
marine and freshwater

Question 7

how many sponge specie lives in marine environment

Answer 7

4850 out of 5000

Question 8

how many sponge specie lives in freshwater

Answer 8

150 out of 5000

Question 9

size ranges

Answer 9

few mm to more than a meter long

Question 10

sponges can be seen through

Answer 10

naked eye

Question 11

types of cell layers present in sponges

Answer 11

1. dermal
2. mesenchyme
3. gastral

Question 12

dermal layer is made up of

Answer 12

pinacocytes

its called pinacoderm

Question 13

mesenchyme layers is made of

Answer 13

amoeboid cells, spicules ( sponging cells)

Question 14

gastral layer is made of

Answer 14

choanocytes

choanoderm

Question 15

chonayctes are what

Answer 15

flagellated cells

Question 16

food source

Answer 16

planktons ( zoo and phyto ) - 20%
detrital organic matter- 80%

Question 17

features of sponges

Answer 17

osculum
ostia
spongocoel

Question 18

digestion occurs as and where

Answer 18

intracellular digestion and in gastral layer

Question 19

respiration and excretion

Answer 19

through water currents

Question 20

gastrovascular cavity is present with how many openings

Answer 20

one - osculum

Question 21

food is carried by

Answer 21

water currents

Question 22

nervous system

Answer 22

absent - only sensory cells are present

Question 23

sensory cells do what

Answer 23

control flow of water

Question 24

sexes

Answer 24

separate or hermaphrodite

Question 25

reproduction

Answer 25

both means

Question 26

asexual reproduction occurs through

Answer 26

budding

internal and external buds

Question 27

internal buds are called

Answer 27

gemmules

feature of phyla

Question 28

remarkable quality of sponges

Answer 28

regeneration

Question 29

skeleton

Answer 29

spicules

present among pinacocytes , also present around ostium and osculum

Question 30

composition of spicules

Answer 30

calcarious, siliceous, spongin fibre - bath sponge

Question 31

choanocytes are also called

Answer 31

collar cells

Question 32

mesenchyme is gelatinous

Question 33

embryo development includes

Answer 33

blastula and larval stages

lack gastrulation stage

Question 34

sponges are protandrous that means

Answer 34

male sex cells develop first

Question 35

examples

Answer 35

sycon
ascon
euplectella
leucoselenia
spongilla

Question 36

sycon is present in

Answer 36

marine environment

Question 37

spongilla is present in

Answer 37

freshwater

Question 38

euplectella

Answer 38

delicate, beautiful, made of galssy framework , aka venus fly basket

Question 39

euplectella is also called

Answer 39

venus fly basket

Question 40

leucoselenia has group of

Answer 40

erect tubes

Question 41

best commercial sponges are found in

Answer 41

WARM WATERS OF MEDITERRANIAN SEA

Question 42

body shows which symmetry

Answer 42

no symmetry asymmetrical

Question 43

spongocoel may be divided into canals or flagellated chambers lines by

Answer 43

choanocytes

Question 44

scolymastra joubini is found in

Answer 44

antarctica
. barrel like glass sponge
. more than a meter tall