Question

Select the odd one out w.r.t primitive Earth.

• A. High Temperature
• B. Volcanic storms
• C. Reducing Atmosphere
• D. $O_2$, Methane and ${\mathrm{NH}}_3$ in the environment

Answer 1

The correct option is D $O_2$, Methane and ${\mathrm{NH}}_3$ in the environment

After the formation of earth, its atmosphere was composed of methane, ammonia, water vapour, and neon, a noble gas, but it lacked free oxygen. This is called as reducing atmosphere. Only after millions of years, the first biological production of oxygen by unicellular organisms and its eventual accumulation in the atmosphere took place.

Swirling mass of gases under the effect of gravity condensed in space which led to the formation of galaxies and planets. Earth was also formed like this and is approximately 4.5 billion years old. There were recurring volcanic eruptions during that time, which created a very uninhabitable and an acutely hostile environment with very high temperature.