Question

why is dark reaction called the biosynthetic phase of photosynthesis?

Answer 1

The phase in which synthesis of organic substances take place is called biosynthetic phase. 

Products of light reaction: ATP, NADPH, CO2and H2O. The next phase of photosynthesis after light reaction  is the biosynthetic phase. In this, ATP and NADPH are used for synthesizing the food.

CO2 is fixed to form CO2 fixation product.This stage is also called the dark phase as it is independent of light, but deals with the products of light reaction. The reaction involved in the biosynthetic phase takes place in the stroma of chloroplasts.

In some plants, the first product of CO2fixation is a 3-carbon compound called 3-phosphoglyceric acid (PGA). These plants are said to adopt the C3 pathway.

In other plants, the first CO2 fixation product is a 4-carbon compound called oxaloacetic acid. These plants are said to adopt the C4pathway.

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Answer 2

ATP, NADPH, O2, ENZYMES, RUBP