48. De Vries gave his mutation theory on organic evolution while working on

(A)Pisum sativum
(B)Drosophila melanogaster
(C)Oenothera lamarckiana
(D)Althea rosea

The NCERT line that answers it

Verbatim line

In the first decade of twentieth century, Hugo deVries based on his work on evening primrose brought forth the idea of mutations – large difference arising suddenly in a population.

Chapter: Evolution
Section: 6.6 MECHANISM OF EVOLUTION
Page: 9
Words matched: 29 of 29

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'Hugo deVries based on his work on evening primrose', and Oenothera lamarckiana is the scientific name for evening primrose, conclusively identifying the correct organism.

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