Carbon Fixation & RuBP in Dark Reaction — NEET Biology
📚 Practice ConceptLet us now ask ourselves a question that was asked by the scientists who were struggling to understand the 'dark reaction'. How many carbon atoms would a molecule have which after accepting (fixing) CO₂, would have 3 carbons (of PGA)?
Which of the following statements are correct regarding photosynthesis? S1: The formation of starch in green leaves is directly dependent on the light energy captured during the photochemical phase of photosynthesis. S2: The products of light reaction, ATP and NADPH, are exclusively used in the stroma to drive the biosynthetic phase (carbon fixation). S3: Oxygen, a byproduct of photosynthesis, is released from the water splitting complex associated with PS II, into the lumen of the thylakoid. S4: The biosynthetic phase of photosynthesis, often called the 'dark reaction,' can continue for an extended period without the presence of light, provided ATP and NADPH are initially available. S5: RuBisCO has a much greater affinity for O2 when the CO2:O2 ratio is nearly equal, leading to photorespiration in C3 plants.
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