redia and cercaria
bipinnaria and brachiolaria
trochophore and aurecularia
none of these
B. bipinnaria and brachiolaria
Schizocoelic coelom
Water vascular system
Spines in the body mass
Marine habitat
excretion
absorption
reproduction
respiration
Holothuria (sea cucumber)
Echinus (sea urchin)
Echittocardium (sand dollar)
Antedon (feather star)
Snail
Slug
Nereis
Sea-urchin
Sea cucumber
Brittle star
Feather star
Both (b) and (c)
Starfish
Jellyfish
Cuttlefish
Fresh water mussel
number of arms
structure of the ambulacral groove
tube feet
pedicellariae
coelenterates
marine arthropods
echinodermates
sponges
Sea-star
Star fish
Sea-cucumber
Sea lily
bipinnaria
glochidium
auralia
echinus
Sea star
sea urchin
Sea cucumber
Feather star
Sea stars
Cake urchins
Sea lilies
Sea cucumbers
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
Sea cucumber
Sea lily
Sea urchin
Sea star
Nervous system with a large brain
Respiratory system
System of internal seleton
Excretory system
spines
tube feet
integumentary structures
none of these
Sea hares
Brittle stars
Star fishes
Sea fish
echinodea
holothuroidea
asteroidea
ophiuroidea
sea-hares
sea-stars
devil fish
sea fans
Asterias
Antedon
Echinus
Ophiothrix
haemal system
digestive system
ambulacral system
reproductive system
an exoskeleton
a spiny skin
bilateral symmetry
gastrovascular cavity
locomotion
respiration
feeding
all of these
Ophiothrix
Pentaceros
Antedon
None of these
Asteroidea
Crinoidea
Ophiuroidea
Holothuroidea
pluteus
echinopluteus
bipinnaria
auricularia
Crinoidea
Asteroidea
Holothuroidea
Ophiuroidea
synapta and antedon
astrias and asterina
ophiothrix and ophioderma
all of these
mouth apparatus
exoskeleton
skeletal system
bioluminscent organ
movable
immovable
prehensile
all of these