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Question

Assertion (A): Without variations, evolution cannot happen.
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 so abundant in nature that no two individuals of a species are similar, not even the monozygotic twins (they possess some dissimilarities due to their environment). Variations are the basic pre-requisite and progressive factor for evolution. Without variations no change could occur in individuals and evolution would be impossible. According to natural selection theory, only useful variations are transmitted to the next generation, but sometimes small variations and genetic disorders which are not useful are also inherited. Hence reason is false.

Biology

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