Which of the following characteristic features always holds true for the corresponding group of animals?

Cartilaginous - Chondrichthyes

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Viviparous - Mammalia

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Possess a mouth with an upper and a lower jaw - Chordata

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One incompletely divided ventricle - Reptilia

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Solution

The correct option is A Cartilaginous - Chondrichthyes
Chondrichthyes is a class that contains the cartilaginous fishes.
Not all mammals are viviparous, the platypus is an egg laying mammal.
Lampreys are fish which belong to the phylum Chordata but they are jawless fishes.
Not all reptiles have one incompletely divided ventricle, crocodiles have a four chambered heart.

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Similar questions

(1)	Cartilaginous endoskeleton	Chondrichthyes
(2)	Viviparous	Mammalia
(3)	Possess a mouth with an upper and lower jaw	Chordata
(4)	3-chambered heart with one incompletely divided ventricle	Reptilia

Heart with incompletely divided ventricle is found in

Question 2

Which of the following joints is immovable?
(a) Shoulder and arm
(b) Knee and joint
(c) Upper jaw and skull
(d) Lower jaw and upper jaw

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