Saurology
Traumatology
Torpedology
Ichthyology
nostrils
mouth
gill slits
swimming bladder
pharyngeal gills
paired fins
dermal scales
all of these
sound production
respiratory
locomotion
hydrostatic
a shell
egg case of skate fishes
a colony of skate fishes
none of these
mollusc
mammal
star fish
bony fish
Shark
Cod
Amia
Both (a) and (b)
Placoid scales
Ventral mouth
Operculum
Five pairs of gill slits
cat fish
dog fish
flying fish
seahorse
the nature of their scales
the position of the mouth
the position of gill slits
the kind of the tail fin
anterior fins
ray fins
pectoral fins
paired fins
Whale
Tadpole
Aquatic urodeles
Common Indian dog fish
Coelocanth
Diodon
Sturgeon
Labeo
having gills not covered by operculum
presence of lateral line system
presence of large scales
presence of terminal mouth
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
respiration
sound production
excretion
movement
dog fish
bony fishes
both (a) and (b)
all fishes
Scoliodon
Electric ray
Whale
Lung fish
vitamin A
iron
calcium
vitamin B complex
sharks
whales
lung fishes
rays
placoid
cycloid
ctenoid
rhombiod
anandromous migration
catadromous migration
cartilaginous fish
none of these
pelvic fins
cloacal fins
anal fins
caudal fins
respiration
excretion
movement
none of these
teleosts
sharks
lung fishes
rays
Five pairs of gills covered with operculum
Homocercal tail
Eight pairs of gills
Any of these
dorsal
ventral
caudal
pelvic
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
Placoid scales
Heterocercal tail fin
Ventrally placed mouth
Operculum