WBCS.LIVE practice question

One of the characteristics of the atmosphere of Prebiotic primitive earth was:

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Absence of hydrogen
  2. Absence of water vapour
  3. Absence of nitrogen
  4. Absence of oxygen

Correct answer and explanation

Correct answer: Absence of oxygen

Explanation: āœ… Correct Answer: D) Absence of oxygen šŸ“š Explanation: The primitive atmosphere of the early Earth was a 'reducing atmosphere,' which means it contained no free oxygen. It was composed of gases like methane, ammonia, water vapor, and hydrogen. Free oxygen only began to accumulate later through the process of photosynthesis by early life forms like cyanobacteria.