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What is carbon fixation, and how does it relate to photosynthesis?

A. It is the absorption of CO2 from the air, and it occurs during the light-dependent reactions.
B. It is the reduction of CO2, and it occurs during the Calvin cycle.
C. It is the conversion of CO2 into organic compounds, and it forms 3-PGA.
D. It is the production of CO2 during regeneration, and it forms RuBP.

Answer :

Final answer:

Carbon fixation is the process that converts CO2 into organic compounds during photosynthesis, specifically in the Calvin cycle. This process allows plants to produce glucose from sunlight energy. Understanding carbon fixation is essential for comprehending how plants synthesize their food and release oxygen.


Explanation:

Understanding Carbon Fixation

Carbon fixation is the process by which atmospheric carbon dioxide (CO2) is converted into organic compounds by living organisms. In plants, this process is a crucial part of photosynthesis, specifically occurring during the Calvin cycle.

The Role in Photosynthesis

During photosynthesis, plants use sunlight to convert CO2 and water into glucose and oxygen. The Calvin cycle, which takes place in the stroma of chloroplasts, utilizes the ATP and NADPH produced during the light-dependent reactions to transform CO2 into stable organic compounds.

  1. The first phase involves the enzyme RuBisCO fixing CO2 to RuBP (ribulose bisphosphate), resulting in a 6-carbon intermediate that splits into two molecules of 3-PGA (3-phosphoglycerate).
  2. Next, 3-PGA undergoes reduction to form G3P (glyceraldehyde-3-phosphate), which can be converted into glucose and other carbohydrates.

Essentially, carbon fixation is fundamental to the process of photosynthesis, enabling plants to store energy from sunlight in the form of organic compounds.


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