Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) :
Assertion (A) : Hugo deVries believed that it is mutation (large difference arising suddenly in a population) which causes evolution and not the minor heritable variations that Darwin described in his theory.
Reason (R) : Evolution for Darwin was gradual, while deVries believed that single step large mutation caused speciation called saltation.
In the light of above statements, choose the most appropriate answer from the options given below.

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A is true, R is false.

Both A and R are false

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

A and R are true and R is not the correct explanation of A.

answer is C.

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Detailed Solution

Hugo deVries based on his work on evening primrose brought forth the idea of mutations – large difference arising suddenly in a population. He believed that it is mutation which causes evolution and not the minor variations (heritable) that Darwin talked about.
Mutations are random and directionless while Darwinian variations are small and directional. Evolution for Darwin was gradual while deVries believed mutation caused speciation and hence called it saltation (single step large mutation).

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