Evolution of Life

The ‘use and disuse theory’ was proposed

by ______________.

• Charles Darwin

• Ernst Haeckel

• Jean Baptiste Lamarck

• Gregor Mendel

Paleontologists deal with

• Embryological evidences

• Fossil evidences

• Vestigial organ evidences

• All the above

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The characters developed by the animals

during their life time, in response to

the environmental changes are called

______________.

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The degenerated and non-functional

organs found in an organism are called

______________.

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The forelimbs of bat and human are

examples of ______________ organs.

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The theory of natural selection for

evolution was proposed by ____________.

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Birds have evolved from reptiles.

• True

• False

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The use and disuse theory of organs’ was

postulated by______________________ .

Homologous organs

• caudal vertebrae and vermiform appendix

• a forelimb of a cat and a bat’s wing

• rudimentary tail and thick hair on the body

• a wing of a bat and a wing of an insect

• radiocarbon dating

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A human hand, a front leg of a cat, a

front flipper of a whale and a bat’s wing

look dissimilar and adapted for different

functions. What is the name given to these

organs?

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