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Question

Classification of a biosynthetic phase of dark reaction as C3 and C4 is primarily based on

A
Intial CO2 fixation
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B
Final CO2 assimilation
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C
First CO2 receptor
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D
Number of ATP get consumed
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Solution

The correct option is A Intial CO2 fixation
The next phase of photosynthesis after the light reaction is the biosynthetic phase. In this, ATP and NADPH are used for synthesizing the food. This stage is also called the dark phase as it is independent of light but deals with the products of the light reaction. The first stable product formed in the C3 cycle is three carbon compound phosphoglyceric acid and in the C4 cycle is four carbon compound oxaloacetic acid. Thus, the classification of biosynthetic phase is primarily based on initial C02 fixation
So, the correct answer is 'Initial C02 fixation'.

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