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

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.

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