Question

First life on earth was

A

Chemoautotrophs

B

Autotrophs

C

Photoautotrophs

D

None of these

Easy

Solution

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Correct option is
A

Chemoautotrophs

  • Life began on earth some 3.8 million years ago and was initially occupied by the single-celled prokaryotic cells, such as bacteria. Multicellular organisms evolved over a billion years later.
  •  However, studies conducted on the genetic material suggest that single-celled living organisms that used carbon dioxide as a source of carbon and oxidized inorganic materials to extract energy were the first forms of life on earth. 
  • These organisms are called chemoautotrophs.

 So, the correct answer is option A.

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