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Crocodile and penguin are similar to whale and dogfish in which one of the following features?
A
Possess a solid single stranded central nervous system
B
Lay eggs and guard them till they hatch
C
Possess bony skeleton
D
Have gill slits at some stage
Detailed Solution
Crocodile (Reptilia), penguin (Aves), whale (Mammalia) and dogfish (Chondrichthyes) are all chordates.
All chordates have a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits at some stage of their life (in reptiles, birds and mammals only in the embryo).
Their central nervous system is dorsal, hollow and single; a solid, ventral, double nerve cord is a non-chordate feature.
The whale is viviparous, so not all of them lay eggs.
The dogfish has a cartilaginous skeleton, so not all of them have a bony skeleton.
Hence the common feature is that they have gill slits at some stage.
All chordates have a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits at some stage of their life (in reptiles, birds and mammals only in the embryo).
Their central nervous system is dorsal, hollow and single; a solid, ventral, double nerve cord is a non-chordate feature.
The whale is viviparous, so not all of them lay eggs.
The dogfish has a cartilaginous skeleton, so not all of them have a bony skeleton.
Hence the common feature is that they have gill slits at some stage.