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Introduction to photosysnthesis

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Question

Transformation of the early reducing atmosphere of the earth into an oxidizing atmosphere was mainly due to the activities of

A

Aerobic photosynthesizers

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B

Anaerobic heterotrophs

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C

Anaerobic photosynthesizers

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D

Anaerobic chemoheterotrophs

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Solution

The correct option is A Aerobic photosynthesizers
Cyanobacteria are thought to be the first aerobic photosynthesizers evolved which gradually increased the oxygen portion of atmosphere changing it into oxidising one. The aerobic respiration was thus helpful for the animals to survive.
Thus, the correct answer is option A.

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