Class Chondrichthyes

Question 1

Characteristics Of Chondrichthyes

In terms of jaw and fins
In terms of notochord
In terms of fertilization and type of birth
In terms of skeleton

Answer 1

They possess jaw and paired fins
Notochord is replaced by vertebrae in adult
Fertilization is internal, they may lay eggs or bear live young
They possess an internal cartilaginous skeleton

Question 2

Characteristics Of Chondrichthyes

In terms of scales
In terms of habitat
In terms of gills

Answer 2

They possess tooth-like scales on the body; these scales are called dermal denticles or placoid scales
They are found mainly in marine habitat, few rays survive in freshwater habitat
They use muscle to pump water over the gills