Column I Column II 1 August Weissman P Mutation theory 2 Hugo de Vries Q Germplasm theory 3 Charles Darwin R Theory of acquired characters 4 Lamarck S Theory of natural selection

Column I Column II Explanation 1 August Weissman P Germplasm theory He disproved the Lamarckism by cutting the tail of mice for several generations. 2 Hugo de Vries Q Mutation theory Mutations are large, sudden and discontinuous variations in a population. These changes are inheritable. Mutations provide the raw material for organic evolution. 3 Charles Darwin R Theory of natural selection He gave the theory of natural selection. This showed the evolution of species. Prodigality of production, struggle for existence, variation and inheritance and survival of the fittest are the major postulates. 4 Lamarck S Theory of acquired characters Certain organisms become specialised by developing specific organs specially under certain environmental conditions. The specialisation is passed over to the next generation via heredity.

The organic remnants of the past life forms preserved on the sedimentary rocks in the earth is called fossils. They are the best and direct evidences of organic evolution. The age of fossils is calculated by radio-carbon dating and many other methods, which tells us about the era when the life form were alive. Fossils are of many types, like: Actual remains like the cryopreserved Woolly mammoth (of Siberia) or insects preserved in amber. Petrified plants and animals. Skeletal elements like bones, teeth, etc. of an animal. Moulds are the hardened encasements formed in the outer parts of organic remains which later decayed leaving cavities. Casts are hardened pieces of mineral matter deposited in the cavities of moulds.

E M B I B E

Biology Standard 12>Chapter 5 - Origin and Evolution of Life>Exercise>Q 3

MEDIUM

12th Maharashtra Board

IMPORTANT

Earn 100

Draw a graph to show that natural selection leads to disruptive change.

Important Questions on Origin and Evolution of Life

EASY

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 5 - Origin and Evolution of Life>Exercise>Q 3

Give the significance of fossils.

EASY

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 5 - Origin and Evolution of Life>Exercise>Q 3

Write the objections to Mutation theory of Hugo de Vries.

EASY

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 5 - Origin and Evolution of Life>Exercise>Q 3

What is disrruptive selection? Give example.

HARD

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 5 - Origin and Evolution of Life>Exercise>Q 4

	Column I		Column II
1	August Weissman	P	Mutation theory
2	Hugo de Vries	Q	Germplasm theory
3	Charles Darwin	R	Theory of acquired characters
4	Lamarck	S	Theory of natural selection