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Question

Assertion (A): Without variations, evolution is impossible.
Reason (R): Only useful variations are transmitted to the next generation.


A

Both A and R are true and R is the correct explanation of A

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B

Both A and R are true but R is not the correct explanation of A

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C

A is true but R is false

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D

A is false but R is true

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Solution

The correct option is C

A is true but R is false


Variations are the basic pre-requisite and progressive factor for evolution because without variations no change could occur in individuals and evolution would be impossible. According to natural selection theory, only useful variations will prevail in the long run. However, all the variations arising in the parents at the DNA level are transmitted to their immediate offsprings.


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