sound production
respiratory
locomotion
hydrostatic
D. 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
live at the bottom of rivers
live in shallow streams
are active swimmers
live in sea water
Oxygen
Carbon dioxide
Fish food
Decoration
respiration
excretion
movement
none of these
Primates
Aves
Crocodiles
Pisces
Saurology
Traumatology
Torpedology
Ichthyology
dorsal
ventral
caudal
pelvic
cartilaginous fishes
bony fishes
lung fishes
paleontological fishes
respiration
sound production
excretion
movement
Shark
Cod
Amia
Both (a) and (b)
ampullae of lorenzini
lateral line system
stato-acoustic organs
neuromast organs
teleosts
sharks
lung fishes
rays
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
pelvic fins
cloacal fins
anal fins
caudal fins
Trygon
Torpedo
Chimaera
Sphynta
Osteichthyes
Chondrichthyes
Dipnoi
Holocephali
Endoderm
Mesoderm
Ectoderm
Integument
pharyngeal gills
paired fins
dermal scales
all of these
all types fishes
only cartilaginous fishes
only bony fishes
sea dwelling fishes
electric fish
saw fish
stone fish
dog fish
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
Sharks
Stingray
Dogfish
Catfish
10 volts
100 volts
50 volts
150 volts
cartilaginous fishes
bony fishes
both (a) and (b)
all fishes except sharks
a shell
egg case of skate fishes
a colony of skate fishes
none of these
Whale
Tadpole
Aquatic urodeles
Common Indian dog fish
nostrils
mouth
gill slits
swimming bladder
Placoid scales
Heterocercal tail fin
Ventrally placed mouth
Operculum