How many quanta of light are needed to reduce one molecule of carbon dioxide to carbohydrate during photosynthesis?

How many quanta of light are needed to reduce one molecule of carbon dioxide to carbohydrate during photosynthesis?

How many quanta of light are needed to reduce one molecule of carbon dioxide to carbohydrate during photosynthesis? 








A. 2
B. 3
C. 4
D. 10-12











Answer: D