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
A. live in sea water and migrate to fresh water rivers and lakes for breeding
Endoderm
Mesoderm
Ectoderm
Integument
sharks
whales
lung fishes
rays
Dasyatis
Chimaera
Sphyma
Torpedo
all types fishes
only cartilaginous fishes
only bony fishes
sea dwelling fishes
cat fish
dog fish
flying fish
seahorse
nostrils
mouth
gill slits
swimming bladder
Placoid scales
Heterocercal tail fin
Ventrally placed mouth
Operculum
pharyngeal gills
paired fins
dermal scales
all of these
Placoid scales
Ventral mouth
Operculum
Five pairs of gill slits
anterior fins
ray fins
pectoral fins
paired fins
Pterois
Fistularia
Gambusia
None of these
dog fish
bony fishes
both (a) and (b)
all fishes
sharks
rays
whales
lung fishes
Oxygen
Carbon dioxide
Fish food
Decoration
electric fish
saw fish
stone fish
dog fish
live at the bottom of rivers
live in shallow streams
are active swimmers
live in sea water
cartilaginous fishes
bony fishes
both (a) and (b)
all fishes except sharks
lungs
air bladders
cartilaginous skeleton
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
dorsal
ventral
caudal
pelvic
the nature of their scales
the position of the mouth
the position of gill slits
the kind of the tail fin
hippocampus
labeo
anabes
none of these
Coelocanth
Diodon
Sturgeon
Labeo
10 volts
100 volts
50 volts
150 volts
placoid
cycloid
ctenoid
rhombiod
Osteichthyes
Chondrichthyes
Dipnoi
Holocephali
Primates
Aves
Crocodiles
Pisces
a shell
egg case of skate fishes
a colony of skate fishes
none of these
having gills not covered by operculum
presence of lateral line system
presence of large scales
presence of terminal mouth
olfactoreceptors
rheoreceptors
gustoreceptors
chemoreceptors