echinoderm

Question 1

echinoderm

Answer 1

a marine invertebrate of the phylum echinodermata

Question 2

endoskeleton

Answer 2

an internal skeleton such as the bony or cartilaginous skeleton of vertebrates

Question 3

pedicellariae

Answer 3

a defensive organ like a minute pincer present in large numbers on an echinderm

Question 4

madreporite

Answer 4

a perforated plate by which the entry of seawater into the vascular system of an echinoderm is controlled

Question 5

radial canal

Answer 5

minute canals lined with choancytes which radiate from the paragastric cavity in some sponges

Question 6

ring canal

Answer 6

water tube that surrounds the esophagus of echinoderms

Question 7

arm/ray

Answer 7

small active tubular projection on the oral face

Question 8

radial symmetry

Answer 8

symmetry around a central axis as in a starfish or tulip flower

Question 9

bilteral symmentry

Answer 9

organism or part of an organism along a central axis or a part that can be divided into two equal halves

Question 10

water vascular system

Answer 10

a network of water vessels in the body the tube feet being operated by hydraulic pressure within the vessels

Question 11

ambulacral groove

Answer 11

extends from the mouth to the end of each ray or arm

Question 12

ossicles

Answer 12

a very small bone especially one of those in the middle ear

Question 13

pyloric caecum

Answer 13

tubular pouches opening into the alimentary canal in pyloric region of most fishes

Question 14

pyloric stomach

Answer 14

junction between the stomach and duodendermum

Question 15

cardiac stomach

Answer 15

occupies much of the posterier aspect of the head and the anterior thoractic body cavity

Question 16

ampullae

Answer 16

place where water is stored

Question 17

gonads

Answer 17

organ that produces gametes a testis or ovary

Question 18

central disc

Answer 18

the side of the surface of the body furthest from the mouth usually contains the anus

Question 19

tube feet

Answer 19

small active tublar projections on the oral face of an echnidoerm

Question 20

external fertilization

Answer 20

sperm cells are eralsed into open water and feralization takes place when the eggs and sperm meet

Question 21

regeneration

Answer 21

the action or process of regeneration or being regenerated in particular the formation of new animal or plant tissue

Question 22

sea star

Answer 22

a starfish

Question 23

brittle star

Answer 23

any class or subclass of echinoderms that have slender flexible arms distinct from the central disk

Question 24

sea urchin

Answer 24

marine echnoderms that has a sherpical or flattned shell covered inmobile spines witha mouth on the underside and calcareous jaws

Question 25

sand dollar

Answer 25

a flattened sea urchin that lives partly bured in sand feeding on detrtus

Question 26

sea lilies

Answer 26

a sedentary marine echniderm that has a small body on a long jointed stalk with festherlike arms to trap food

Question 27

feather stars

Answer 27

small dislike body long feathery arms for feeding and movement and short appendedges for grasping the surface

Question 28

sea cucumbers

Answer 28

thick worm like body with tentacles around the mouth

Question 29

sea daises

Answer 29

small circular animls realated to sea stars