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  4. The first step in dark reaction of photosynthesis is

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Q. The first step in dark reaction of photosynthesis is

UP CPMTUP CPMT 2004Photosynthesis in Higher Plants

Solution:

The dark phase of photosynthesis involves fixation of $CO_2$ by the enzyme ribulose bisphosphate carboxylase [RUBISCO]. The two substrates are $CO_2$ and 1,5- bisphosphate (RuBP) and the product is the 3 - carbon compound, 3 - PGA (3 - phosphoglyceric acid). RuBP is a 5 - C sugar.