Final answer:
The correct answer encompasses both B. light Reactions and C. Calvin Cycle as the main events of photosynthesis, where light energy is captured and then used to create carbohydrates through carbon fixation.
Step-by-step explanation:
The main events of photosynthesis include light reactions and the Calvin cycle, which is also known as the light-independent reactions. The correct answer to the student's question, "The main events of photosynthesis (ordinary level)is _______." is B. light Reactions and C. Calvin Cycle.
Light reactions harness energy from the sun to produce chemical bonds, ATP, and NADPH. These energy carriers are then used in the Calvin cycle, which can be divided into three stages: fixation, reduction, and regeneration. During carbon fixation, inorganic CO₂ gas is converted into organic compounds. Thus, the light reactions and the Calvin cycle are core processes of photosynthesis that lead to the creation of carbohydrates using captured light energy.