CNIDARIA

Question 1

cnidaria is also called

Answer 1

coelenterata

Question 2

their two main features

Answer 2

nematocysts and polymorphism

Question 3

which give rise to nematocysts

Answer 3

cnidocytes

Question 4

tentacles are present around which structures

Answer 4

mouth and body

Question 5

ectoderm give rise to cnidocytes which give rise to

Answer 5

nematocysts

Question 6

size range

Answer 6

microscopic hydra to 2 meter long branchioceranthus

Question 7

branchioceranthus size

Answer 7

about 2 meters

Question 8

hydra can be seen by

Answer 8

microscope

Question 9

habitat

Answer 9

aquatic

Question 10

food source

Answer 10

carnivores

Question 11

form of life

Answer 11

sessile, motile, and colonial

Question 12

sessile cnidaria example

Answer 12

hydra, obelia, sea anemone

Question 13

motile

Answer 13

jelly fish

aurelia- medusae are dominant and polyps are reduced

Question 14

example of colonial cnidaria

Answer 14

obelia, physalia, vellela

saray l waly

Question 15

symmetry

Answer 15

radiata

Question 16

germ layers

Answer 16

two layers and mesoglea

Question 17

organs are

Answer 17

present byt organ system is absent

Question 18

which cells are specialized for digestion of food
1. ectodermal
2. endodermal

Answer 18

endodermal cells `

ecto give rise to cnidocytes

Question 19

the digestive cavity is called

Answer 19

enteron/ gastrovascuar cavity

one openng is present

Question 20

branchioceranthus is which polyp

Answer 20

hydrozoan

Question 21

how many zooids are present

Answer 21

main two wesay 5 are possible

Question 22

polyps and medusae role

Answer 22

nutritive and reproduction respectively

Question 23

characteristics of medusae

form of life

Answer 23

motile in nature
DIPLOID
reproductive role
have gonads
produce gamets
diploid in nature

Question 24

characteristics of polyps

Answer 24

nutrition
sessile

beth kr khatay hain yeh

Question 25

obelia has three types of zooids

Question 26

alternation of generation is present in

Answer 26

obelia

Question 27

examples

Answer 27

jelly fish( aurelia) , sea anemone( actinia), hydra, obelia, physalia, corals( madrepora), vellela

Question 28

aurelia

Answer 28

jelly fish medusae are dominant and polyp are reduced

Question 29

actinia

Answer 29

sea anemone sessile only polyps gastrovascular cavity divided into large partitions by septum called MESENTERIES | enteron - cavity

Question 30

madrepora

Answer 30

corals exoskeleton CaCO3 form small coral islands and large coral reefs rock gardens, aquaria, jewllery

Question 31

hydra reproduces asexualy through

Answer 31

budding

Question 32

repro of obelia

Answer 32

blastocyle(sessile)- asexual repro- medusae(motile)- sexual repro- gametes- join to form colonies

Question 33

zooids present in obelia

Answer 33

nutritive- gastrozoids asexual repro- gonozoids and blastocyle sexual- medusae