question_answer

Explain with an example for each, how the following provides evidences in favour of evolution in organisms:

(a) Homologous organs

(b) Analogous organs

(c) Fossils

Answer:

(a) Homologous organs: Study of homologous organs suggests that the organs having same structures but performing different functions have evolved from a common ancestor. e.g., Forelimbs of a frog, lizard, birds and man.

(b) Analogous organs: Shows adoption of organs for common use.

e.g., Wings of butterfly and wings of bat.

(c) Fossils ? Provides the missing links between two species.

e.g., Archeopteryx