Advertisements
Advertisements
प्रश्न
During the origin of life, which among the following was not found in free form?
पर्याय
Methane
Ammonia
Oxygen
Hydrogen
MCQ
Advertisements
उत्तर
Oxygen
Explanation:
Oxygen was not present in its free form at the time life first evolved. Blue-green algae were the main source of its production. UV rays converted the molten mass water vapour to oxygen and hydrogen.
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
