Answer :
Final answer:
ATP is the substance needed to directly produce both triose phosphates and RuBP. It is an output of the light-dependent reactions in photosynthesis, and it is then used in the light-independent reactions (Calvin cycle) to convert 3-PGA into G3P, some of which will be converted into glucose and some into RuBP.
Explanation:
The substance needed directly to produce both triose phosphates and RuBP (Ribulose bisphosphate) is D) ATP. In the process of photosynthesis, ATP is a form of chemical energy produced in the light-dependent reactions. This ATP is then used in the Calvin cycle, or the light-independent reactions. In the Calvin cycle, ATP is used along with NADPH to convert 3-phosphoglycerate (3-PGA) into glyceraldehyde 3-phosphate (G3P). Some of the G3P molecules are then converted into glucose, while the remaining are used to regenerate RuBP. For example, three RuBP molecules get converted to six G3P, then five G3P molecules with the help of five ATPs are converted back to three molecules of RuBP.
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