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Question
If there were no cyanobacteria in the primitive earth, which of the following gases would not have evolved?
If there were no cyanobacteria in the primitive earth, which of the following gases would not have evolved?
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Solution
The correct option is A Oxygen
Earth is estimated to have formed about 4.5 billion years ago. The temperature of Earth in its primitive times was very hot and the surface was in a molten state which after cooling resulted in a huge emission of carbon dioxide, water vapours, methane and ammonia. Early atmosphere of Earth had no free oxygen, which was reducing in nature. The organisms that are most primitive or the first to evolve on earth were bacteria. The earth before the evolution of these bacteria was devoid of oxygen. Blue-green algae or cyanobacteria is not an algae, rather a bacteria. These chlorophyll bearing units of life for the first time started using solar energy for the production as well as liberation of free oxygen into the atmosphere giving greater possibilities for life to evolve.
If there were no chlorophyll bearing bacteria, free oxygen would not have been released in the atmosphere and evolution possibilities for other oxygen dependent organisms may not not have occurred.
Early atmosphere had methane, hydrogen and carbon dioxide even before the appearance of cyanobacteria.
Earth is estimated to have formed about 4.5 billion years ago. The temperature of Earth in its primitive times was very hot and the surface was in a molten state which after cooling resulted in a huge emission of carbon dioxide, water vapours, methane and ammonia. Early atmosphere of Earth had no free oxygen, which was reducing in nature. The organisms that are most primitive or the first to evolve on earth were bacteria. The earth before the evolution of these bacteria was devoid of oxygen. Blue-green algae or cyanobacteria is not an algae, rather a bacteria. These chlorophyll bearing units of life for the first time started using solar energy for the production as well as liberation of free oxygen into the atmosphere giving greater possibilities for life to evolve.
If there were no chlorophyll bearing bacteria, free oxygen would not have been released in the atmosphere and evolution possibilities for other oxygen dependent organisms may not not have occurred.
Early atmosphere had methane, hydrogen and carbon dioxide even before the appearance of cyanobacteria.
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