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Divergent Evolution

Based on obse...

Question

Based on observations made during a sea Voyage, Charles Darwin concluded that

A

Evolution of life forms had occurred driven by use and disuse of organs

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B

Allelic frequencies in a population are stable and is constant from generation to generation

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C

Mutation causes evolution as these are random and directionless

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D

Existing life forms share similarities to varying degrees not only among themselves but also with life forms that existed millions of years ago.

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Solution

The correct option is D Existing life forms share similarities to varying degrees not only among themselves but also with life forms that existed millions of years ago.
Use and disuse-lamarck.
Allelic frequencies are not stable.
Darwin thought variations as force behind evolution.

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Q. Statement 1: Charles Darwin concluded that existing living forms share similarities to varying degrees not only among themselves but also with the life forms that existed millions of years ago.

Statement 2: According to Darwin, fitness refers ultimately and only to reproductive fitness.

Q. Consider the following three statements and select the correct option stating which one is true (T) and which one is false (F).
(i) Oparin of Russia and Haldane of England proposed that the first form of life could have come from pre-existing non-living organic molecules (e.g., RNA, protein, etc.) and that formation of life was preceded by chemical evolution.
(ii) Based on observations made during a sea voyage round the world, Charles Darwin concluded concluded that existing living forms share similarities to varying degrees only among themselves.
(iii) Evolution by natural selection must have started when cellular forms of life with different metabolic capability originated on Earth.

Q. Evolution of life shows that life forms had a trend of moving from _________________.

Q. Given below are the three statements each with one or two blanks. Select the option which correctly fills up the blanks in any two statements.
(A) For a long time it was also believed that life came out of decaying and rotting matter like straw, mud, etc. This was the theory of (i).
(B) During post-industrialistion period, the tree trunks became dark due to industrial smoke and soots. Under this condition the (i) did not survive due to predators, while (ii) survived.
(C) Lamarck said that evolution of life forms had occurred but driven by (i) of organs.

Q. Short/Long answer type questions
Explain taking one example of vertebrate anatomy that evolution of life forms has occurred on Earth.

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