A group of cartilaginous fishes specialised for bottom dwelling is
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An anamniote group is
Sharks and rays can be distinguished by
Pectoral fins are not clearly marked off from the body in
Water into the gills of fishes passes through
The fish used to control spread of malaria is
Parental care is a characteristic of
Chondrichthyes differs from Osteichthves in
Cod liver oil is a rich source of
Which of the following does not have lateral line organs ?
The saw fish Pristis is a member of the class
Fish scales originate from one of the following?
A fish is characterised by the presence of
A muscular fin, aiding in propulsion is
Anandromous fishes are those which
The pair of fins seen on either side of cloaca of fishes are the
Which one of the cartilaginous fishes posses an operculum over the gill ?
Which fish is famous for cod liver oil ?
Salmon is an example of
Torpedo, the electric ray, could give a shock of about
In Scoliodon, the thermoreceptors are
Air bladder in fishes does not help in
In sharks, the scales are
Heterocercal tail fin is a characteristic of which group of fishes?
The tympanum is absent in
Placoid scales are found in
Fillibranch gills are present in
In fishes, the lateral line receptors are
Fishes swim in water because they have
The pair of fins found near the operculum in bony fishes is known as
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