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Which of the following gases was absent on primitive earth?

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Question

Which of the following gases was absent on primitive earth?

Options

  • CO2

  • CH4

  • NH3

  • O2

MCQ
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Solution

O2

Explanation:

The primitive atmosphere was reducing and lacked free oxygen. Carbon dioxide, methane and ammonia were among the gases associated with the early atmosphere.

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Chapter 8: Evolution-Origin of Life - EXERCISES [Page 458]

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Sarita Aggarwal Biology [English] Class 12 ISC
Chapter 8 Evolution-Origin of Life
EXERCISES | Q I. 2. | Page 458
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