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Dear student,
The biosynthetic phase of photosynthesis does not directly depend on the presence of light but is dependent on the products of the light reaction which are ATP and NADPH. The biosynthetic process starts immediately after light becomes unavailable and continue for some time, and then stops. If light available for sometimes and becomes again unavailable the process of biosynthesis starts again.
Therefore, the dark reaction occurs during short dark intervals.
The correct option is (4).
Regards
The biosynthetic phase of photosynthesis does not directly depend on the presence of light but is dependent on the products of the light reaction which are ATP and NADPH. The biosynthetic process starts immediately after light becomes unavailable and continue for some time, and then stops. If light available for sometimes and becomes again unavailable the process of biosynthesis starts again.
Therefore, the dark reaction occurs during short dark intervals.
The correct option is (4).
Regards