Select the gases which combined with oxygen to form water, carbon dioxide and others organic compounds earlier on earth.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Ammonia and Methane
Option (1) Ammonia and Methane — Correct. Of the options, only ammonia and methane are the gases NCERT says combined with oxygen; the lighter hydrogen escaped.
NCERT Extract:
Origin of Life – “… Water vapour, methane, carbondioxide and ammonia released from molten mass covered the surface. The UV rays from the sun brokeup water into Hydrogen and Oxygen and the lighter H2 escaped. Oxygen combined with ammonia and methane to form water, CO2 and others.”