Statement I: Branching descent and natural selection are the two key concepts of Darwinian theory of

Question

Statement I: Branching descent and natural selection are the two key concepts of Darwinian theory of evolution.\ Statement II: Darwin had said that evolution of life forms had occurred but driven by use and disuse of organs.\

Professor PC Thomas Classes · Answer

(b) : Lamarck had said that evolution of life forms had occurred but driven by use and disuse of organs. He gave the examples of Giraffes who in an attempt to forage leaves on tall trees had to adapt by elongation of their necks. As they passed on this acquired character of elongated neck to succeeding generations, Giraffes, slowly, over the years, came to acquire long necks.