Question

According to the theory of abiogenesis, primitive Earth’s atmosphere, devoid of life, consisted of a mixture of:

• A. Oxygen, hydrogen, methane, ammonia
• B. Water vapour, hydrogen, ammonia and methane
• C. Ozone, oxygen and water vapour
• D. Hydrogen, carbon dioxide, ammonia

Answer 1

The correct option is B Water vapour, hydrogen, ammonia and methane

The theory of biochemical evolution or abiogenesis is the most accepted theory for origin of life on Earth. According to this theory, primitive earth was devoid of oxygen and had a reducing atmosphere containing methane, ammonia, hydrogen and water vapour.