Osteichthyes
Chondrichthyes
Dipnoi
Holocephali
B. Chondrichthyes
Osteichthyes
Chondrichthyes
Dipnoi
Holocephali
Coelocanth
Diodon
Sturgeon
Labeo
Sharks
Stingray
Dogfish
Catfish
the nature of their scales
the position of the mouth
the position of gill slits
the kind of the tail fin
sharks
rays
whales
lung fishes
olfactoreceptors
rheoreceptors
gustoreceptors
chemoreceptors
Endoderm
Mesoderm
Ectoderm
Integument
anandromous migration
catadromous migration
cartilaginous fish
none of these
respiration
sound production
excretion
movement
Saurology
Traumatology
Torpedology
Ichthyology
Whale
Tadpole
Aquatic urodeles
Common Indian dog fish
mollusc
mammal
star fish
bony fish
cartilaginous fishes
bony fishes
both (a) and (b)
all fishes except sharks
Five pairs of gills covered with operculum
Homocercal tail
Eight pairs of gills
Any of these
anterior fins
ray fins
pectoral fins
paired fins
pharyngeal gills
paired fins
dermal scales
all of these
sawfish
seahorse
electric ray
sucker fish
nostrils
mouth
gill slits
swimming bladder
placoid
cycloid
ctenoid
rhombiod
Oxygen
Carbon dioxide
Fish food
Decoration
dog fish
bony fishes
both (a) and (b)
all fishes
teleosts
sharks
lung fishes
rays
respiration
excretion
movement
none of these
Pterois
Fistularia
Gambusia
None of these
sound production
respiratory
locomotion
hydrostatic
10 volts
100 volts
50 volts
150 volts
electric fish
saw fish
stone fish
dog fish
dorsal
ventral
caudal
pelvic
live at the bottom of rivers
live in shallow streams
are active swimmers
live in sea water
ampullae of lorenzini
lateral line system
stato-acoustic organs
neuromast organs