an exoskeleton
a spiny skin
bilateral symmetry
gastrovascular cavity
B. a spiny skin
Sea hares
Brittle stars
Star fishes
Sea fish
haemal system
digestive system
ambulacral system
reproductive system
Sea cucumber
Sea lily
Sea urchin
Sea star
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
sea-hares
sea-stars
devil fish
sea fans
spines
tube feet
integumentary structures
none of these
mouth apparatus
exoskeleton
skeletal system
bioluminscent organ
redia and cercaria
bipinnaria and brachiolaria
trochophore and aurecularia
none of these
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
echinodea
holothuroidea
asteroidea
ophiuroidea
herbivorous
omnivorous
carnivorous
none of these
coelenterates
polychaetes
echinodermates
hemichordates
tube feet
lobopodia
cephalopodia
rhizopodia
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
locomotion
respiration
feeding
all of these
Schizocoelic coelom
Water vascular system
Spines in the body mass
Marine habitat
A fresh water echinoderm
An ancient Greak ship lantern shaped structure connected with balancing system of seal lily
A masticatory apparatus connected with digestive system in sea urchin
A seive plate connected with ambulacral system in sea star
(a) Starfish
(b) Brittle star
(c) Sea lily
(d) None of these
digestive system
water vascular system
canal system
none of these
Star fish
Sea fan
Ship worm
None of these
coelenterates
marine arthropods
echinodermates
sponges
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
synapta and antedon
astrias and asterina
ophiothrix and ophioderma
all of these
movable
immovable
prehensile
all of these
Antedon
Echinocardium
Ophiothrix
Pentaceros
Sea-star
Star fish
Sea-cucumber
Sea lily
parapodia
pseudopodia
setae
tube feet
torneria
onchosphere
trochophore
bipinnaria
Snail
Slug
Nereis
Sea-urchin
Axial sinus
Dermal papillae
Tube feet
Tiedamann bodies