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Which of the following are required for the dark reaction of photosynthesis? A. Light B. Chlorophyll C. CO₂ D. ATP E. NADPH Choose the correct answer from the options given below:
The dark reaction directly assimilates CO₂ (C) using assimilatory power generated during light reaction: ATP (D) and NADPH (E)! Light (A) is not directly required!
Photosynthesis consists of two phases: light reactions (photochemical phase) occurring in thylakoids, producing ATP, NADPH, and O₂; and dark reactions (biosynthetic phase) occurring in the stroma, where sugars are synthesized.
The dark reaction does not directly require light. It requires: 1. Atmospheric carbon dioxide () as the carbon source (C). 2. to supply energy for reduction and regeneration (D). 3. to supply reducing equivalents ( and electrons) for reduction of 3-PGA to G3P (E).
C, D, and E are the indispensable chemical requirements, corresponding to Option (1).
Diagnose every choice: Know exactly why the right option works and why distractors fail.
CO₂, ATP, and NADPH are the specific chemical reactants utilized during the Calvin cycle in the stroma.
Omits NADPH (E), which is mandatory for the reduction phase of PGA.
Dark reactions do not directly require light (A) or thylakoid chlorophyll (B).
Omits CO₂ (C), without which carbon fixation cannot take place.
Assuming chlorophyll is directly needed in the stroma for dark reaction enzymes.
"The products of light reaction are ATP, NADPH and O2... The phase of photosynthesis that results in the synthesis of food (sugar) is called the biosynthetic phase. This process does not directly depend on the presence of light but is dependent on the products of the light reaction, i.e., ATP and NADPH, besides CO2 and H2O."
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