Question

In on optimum light condition a plant is kept and later on $C{O}_2$ supply was blocked the effect upon conc of RuBP and 3PGA will be -

• A. RuBP Ises and 3 PGA Ises
• B. RuBP Ises and 3PGA Ises
• C. RuBP unchanged and 3PGA Ises
• D. RuBP Ises and 3PGA unchanged

Answer 1

The correct option is C RuBP unchanged and 3PGA Ises

C3 pathway is the major pathway for the fixation of carbon dioxide. It represents the dark reaction of photosynthesis. RuBP enzyme is very much sensitivity to carbon dioxide (40-60 ppm of CO2). RuBP first combines with the CO2 to form a product 3PGA.

So the correct option is "RuBP is unchanged and 3PGA less".