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Answer this question in 50-60 words. Name the four gases which were present in the primitive atmosphere. Which kingdom
was the first to evolve on earth?

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Solution

Dear Student

Gases present in primitive atmosphere were Methane (CH4), Carbon monoxide (CO), Hydrogen (H2), Ammonia (NH3), Nitrogen (N2) and Water (H2O). Primitive atmosphere was reducing atmosphere. Present atmosphere is oxidising atmosphere containing oxygen, nitrogen, carbon dioxide and water.
This was experimentally demonstrated by Miller.

Blue-Green algae are supposed to be the first life forms on the Earth. They belong to Kingdom Monera. So, Kingdom Monera evolved first.

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