Consider the following molecules involved in photosynthesis: I. ATP II. O ₂ III. NADPH IV. CO ₂ V. H ₂ O Which of the above molecules are the products of the light reaction that are specifically utilized in the biosynthetic phase (dark reac

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Consider the following molecules involved in photosynthesis: I. ATP II. O ₂ III. NADPH IV. CO ₂ V. H ₂ O Which of the above molecules are the products of the light reaction that are specifically utilized in the biosynthetic phase (dark reaction)?

Quantrex Academy · Accepted Answer

Correct answer: D. I and III only

The light reaction (photochemical phase) of photosynthesis produces ATP, NADPH, and O ₂ . Among these, O ₂ diffuses out of the chloroplast as a byproduct. The ATP and NADPH produced are utilized to drive the processes leading to the synthesis of food (sugars) during the biosynthetic phase (dark reaction). CO ₂ is a reactant for the dark reaction but is not produced by the light reaction. H ₂ O is consumed during the light reaction, not produced. Therefore, only ATP and NADPH bridge the two phases. Answer: I and III

Consider the following molecules involved in photosynthesis: I. ATP II. O ₂ III. NADPH IV. CO ₂ V. H ₂ O Which of the above molecules are the products of the light reaction that are specifically utilized in the biosynthetic phase (dark reaction)?

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