Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyPhotosynthesis4 Marks
Question
Explain how light and dark reactions of photosynthesis are interdependent.
✓
Answer
Link between light-dependent and dark reactions: 1. The light reaction gives rise to two important products, a reducing agent $NADPH _2$ and an energy-rich compound ATP. Both these are utilized in the dark phase of photosynthesis. 2. ATP and $NADPH _2$ molecules function as vehicles for transfer of energy of sunlight into dark reaction leaving to carbon fixation. In this reaction $CO _2$ is reduced to carbohydrate. 3. During dark reaction, ATP and $NADPH _2$ are transformed into ADP, iP and NADP which are transferred to the grana in which light reaction takes place.
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