Question

In which two categories, the organisms are divided on the basis of evolution? How are the two categories different from each other?

Answer 1

The two categories are:

1.Homologous organs:These organs have same basic structure but different funtions.Ex:Forelimbs of lizard and hand of human

2.Analogous organs:These organs have different basic structurestructures but do same functions.Ex:wings of a bird and wings of a butterfly

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Answer 2

Answer:

On the basis of evolution, the organisms are divided into two categories :

(a) ‘Primitive’ or ‘lower’ organisms

(b) ‘Advanced’ or ‘higher’ organisms

Advanced organisms are the result of gradual development of more complex organisms from the simpler ones i.e., primitive organisms.