Question

carbon is added to rubp in what step of photosynthesis?
a light reactions
b the krebs cycle
c the calvin cycle

Explanation:

• Light reactions: Convert light energy to chemical energy (ATP and NADPH), no carbon addition to RuBP.
• Krebs cycle: Part of cellular respiration, not photosynthesis.
• Calvin cycle: In carbon - fixation phase, CO₂ (carbon) is added to RuBP (ribulose - 1,5 - bisphosphate) by the enzyme Rubisco.

Answer:

C. the Calvin cycle