Which of the following component was not the part of S.L. Miller's ex…

The correct answer is Option (4) → N₂

S.L. Miller tried to copy the conditions of the early earth in the laboratory. Its atmosphere was a reducing atmosphere, with no free oxygen.

Option (1) CH₄ — A part of Miller’s experiment. Methane was one of the gases of the early atmosphere. It gave the carbon for the organic molecules.

Option (2) NH₃ — A part of Miller’s experiment. Ammonia was also present. It gave the nitrogen found in the amino acids.

Option (3) Water vapour — A part of Miller’s experiment. Water vapour stood for the vapour of the early earth, which later fell as rain and formed the oceans.

Option (4) N₂ — Not a part of Miller’s experiment. Nitrogen gas was not used in the flask. The nitrogen of the amino acids came from ammonia.

NCERT Extract:
Origin of Life – …