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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