dog fish
bony fishes
both (a) and (b)
all fishes
Whale
Tadpole
Aquatic urodeles
Common Indian dog fish
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
Placoid scales
Ventral mouth
Operculum
Five pairs of gill slits
pelvic fins
cloacal fins
anal fins
caudal fins
a rounded body with ventral gill clefts
a flattened body with dorsal gill clefts
a flattened body with ventral gill clefts
any of these
having gills not covered by operculum
presence of lateral line system
presence of large scales
presence of terminal mouth
lungs
air bladders
cartilaginous skeleton
fins
Osteichthyes
Chondrichthyes
Dipnoi
Holocephali
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
anandromous migration
catadromous migration
cartilaginous fish
none of these
Endoderm
Mesoderm
Ectoderm
Integument
cartilaginous fishes
bony fishes
both (a) and (b)
all fishes except sharks
Dipnoi
Osteichthyes
Cyclostomata
Chondrichthyes
Placoid scales
Heterocercal tail fin
Ventrally placed mouth
Operculum
Scoliodon
Electric ray
Whale
Lung fish
sharks
rays
whales
lung fishes
vitamin A
iron
calcium
vitamin B complex
pharyngeal gills
paired fins
dermal scales
all of these
Trygon
Torpedo
Chimaera
Sphynta
Oxygen
Carbon dioxide
Fish food
Decoration
a shell
egg case of skate fishes
a colony of skate fishes
none of these
dorsal
ventral
caudal
pelvic
Primates
Aves
Crocodiles
Pisces
cat fish
dog fish
flying fish
seahorse
Five pairs of gills covered with operculum
Homocercal tail
Eight pairs of gills
Any of these
sharks
whales
lung fishes
rays
10 volts
100 volts
50 volts
150 volts
live at the bottom of rivers
live in shallow streams
are active swimmers
live in sea water