Match the following and choose the correct option.
Set – I Set – II
a Rensch's rule 1 Body size
b Bergman’s rule 2 Wings
c Allen’s rule 3 Vertebra number
d Jordan’s rule 4 Organ size
a b c d
(1) 1 2 4 3
(2) 3 4 2 1
(3) 2 1 3 4
(4) 2 1 4 3

Difficult

Solution

Rensch's rule Wings -Birds in colder regions have narrow wings compared to broad wings of of birds in warmer regions
Bergman's rule Body size- Species of colder regions have larger body size.
Allen's rule Organ size-Mammals from colder climates have shorter ears and limbs
to minimise heat loss.
Jordan's rule Vertebrae-Fishes in cold waters have more vertebrae compared to fishes inhabiting warm waters.

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Rensch's rule	Wings -Birds in colder regions have narrow wings compared to broad wings of of birds in warmer regions
Bergman's rule	Body size- Species of colder regions have larger body size.
Allen's rule	Organ size-Mammals from colder climates have shorter ears and limbs to minimise heat loss.
Jordan's rule	Vertebrae-Fishes in cold waters have more vertebrae compared to fishes inhabiting warm waters.