[Cartilaginous endoskeleto...] Which of the following characteristic features always holds true for the corresponding group of anim

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Aptitude

TNPSC G4

10th CBSE Maths

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

3 – chambered heart with one incompletely divided ventricle - Reptilia

Cartilaginous endoskeleton - Chondrichthyes

Viviparous - Mammalia

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

Explanation:

Chondrichthyes has endoskeleton made up of cartilage.
All Mammals are Viviparous except platypus which is Oviparous.
All Chordates posses a mouth with an upper and a lower jaw except agnatha which are without jaws.
All reptiles have 3 - chambered heart except crocodile and tortoise in which heart is four chambered.

Additional Questions

Match the terms in Column I with their description in Column II and choose the correct option:

Column I	Column II
(a) Dominance	(i) Many genes govern a single character
(b) Codominance	(ii) In a heterozygous organism only one allele expresses itself
(c) Pleiotropy	(iii) In a heterozygous organism both alleles express themselves fully
(d) Polygenic inheritance	(iv) A single gene influences many characters

Code:
(a) (b) (c) (d)

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