respiration
excretion
movement
none of these
D. none of these
cartilaginous fishes
bony fishes
both (a) and (b)
all fishes except sharks
a rounded body with ventral gill clefts
a flattened body with dorsal gill clefts
a flattened body with ventral gill clefts
any of these
Saurology
Traumatology
Torpedology
Ichthyology
cat fish
dog fish
flying fish
seahorse
respiration
excretion
movement
none of these
ampullae of lorenzini
lateral line system
stato-acoustic organs
neuromast organs
vitamin A
iron
calcium
vitamin B complex
Oxygen
Carbon dioxide
Fish food
Decoration
Trygon
Torpedo
Chimaera
Sphynta
electric fish
saw fish
stone fish
dog fish
Coelocanth
Diodon
Sturgeon
Labeo
a shell
egg case of skate fishes
a colony of skate fishes
none of these
Shark
Cod
Amia
Both (a) and (b)
10 volts
100 volts
50 volts
150 volts
Osteichthyes
Chondrichthyes
Dipnoi
Holocephali
sharks
rays
whales
lung fishes
placoid
cycloid
ctenoid
rhombiod
sound production
respiratory
locomotion
hydrostatic
live in sea water and migrate to fresh water rivers and lakes for breeding
live in fresh water and migrate to sea for breeding
both (a) and (b)
none of these
lungs
air bladders
cartilaginous skeleton
fins
all types fishes
only cartilaginous fishes
only bony fishes
sea dwelling fishes
Placoid scales
Ventral mouth
Operculum
Five pairs of gill slits
pelvic fins
cloacal fins
anal fins
caudal fins
the nature of their scales
the position of the mouth
the position of gill slits
the kind of the tail fin
olfactoreceptors
rheoreceptors
gustoreceptors
chemoreceptors
dorsal
ventral
caudal
pelvic
having gills not covered by operculum
presence of lateral line system
presence of large scales
presence of terminal mouth
Five pairs of gills covered with operculum
Homocercal tail
Eight pairs of gills
Any of these
Placoid scales
Heterocercal tail fin
Ventrally placed mouth
Operculum
respiration
sound production
excretion
movement