(i) Closed flask containing NH 3 CH4, H2 and water vapour to simulate primitive atmosphere on earth. (ii) Electric discharge (iii) Formation of compounds like aminoacids from simple molecules like NH3, CH4 H2. Chlorophyte ancestors …. Rhynia like plants …. Cycads… Gnetales…. Dicotyledone …. Monocotyledone. Stabilising natural selection Directional natural selection Disruptive natural selection Refer page no. 136 NCERT book. . Refer page 140-141 NECRT book.
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