sharks
rays
whales
lung fishes
B. rays
Primates
Aves
Crocodiles
Pisces
olfactoreceptors
rheoreceptors
gustoreceptors
chemoreceptors
cat fish
dog fish
flying fish
seahorse
Shark
Cod
Amia
Both (a) and (b)
cartilaginous fishes
bony fishes
both (a) and (b)
all fishes except sharks
nostrils
mouth
gill slits
swimming bladder
electric fish
saw fish
stone fish
dog fish
having gills not covered by operculum
presence of lateral line system
presence of large scales
presence of terminal mouth
a shell
egg case of skate fishes
a colony of skate fishes
none of these
all types fishes
only cartilaginous fishes
only bony fishes
sea dwelling fishes
placoid
cycloid
ctenoid
rhombiod
Placoid scales
Heterocercal tail fin
Ventrally placed mouth
Operculum
Oxygen
Carbon dioxide
Fish food
Decoration
a rounded body with ventral gill clefts
a flattened body with dorsal gill clefts
a flattened body with ventral gill clefts
any of these
Trygon
Torpedo
Chimaera
Sphynta
Coelocanth
Diodon
Sturgeon
Labeo
the nature of their scales
the position of the mouth
the position of gill slits
the kind of the tail fin
vitamin A
iron
calcium
vitamin B complex
Five pairs of gills covered with operculum
Homocercal tail
Eight pairs of gills
Any of these
sharks
rays
whales
lung fishes
respiration
sound production
excretion
movement
sawfish
seahorse
electric ray
sucker fish
Saurology
Traumatology
Torpedology
Ichthyology
mollusc
mammal
star fish
bony fish
sharks
whales
lung fishes
rays
10 volts
100 volts
50 volts
150 volts
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
Sharks
Stingray
Dogfish
Catfish
anterior fins
ray fins
pectoral fins
paired fins
dog fish
bony fishes
both (a) and (b)
all fishes