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Theory of Abiogenesis

The presence ...

Question

The presence of oxygen was the reason for the origin of photoautotrophs on primitive Earth.

A

False

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B

True

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Solution

The correct option is A False
Primitive Earth was devoid of oxygen. As a result, the first cellular forms of life on Earth were anaerobic chemotrophs which survived in the oceans.

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Q. Statement 1 : In due course of evolution, the number of photoautotrophs increased and enormous amounts of oxygen was released in the sea and primitive atmosphere.

Statement 2 : This oxygen then reacted with methane and ammonia leading to transform them into carbon dioxide and free nitrogen.

Q. Assertion :The primitive atmosphere was reducing one, i.e., without oxygen. Reason: In the primitive atmosphere, oxygen was involved in forming ozone.

Q. Assertion :The primitive atmosphere was reducing one i.e., without oxygen. Reason: In the primitive atmosphere, oxygen was involved in forming ozone layer.

There was plenty of oxygen present in the atmosphere of primitive Earth.

Q. How primitive life might have originated on earth was experimentally shown by

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Theory of Abiogenesis

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