PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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High-energy electrons move through the electron transport chain.
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ATP and NADPH are used to produce high-energy sugars.
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ATP synthase helps in making NADPH.
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Pigments in photosystems II and I absorb light.
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Detailed explanation-1: -The primary role of ATP synthase in the light-dependent reactions is to phosphorylate ADP to create ATP.
Detailed explanation-2: -In a process called non-cyclic photophosphorylation (the “standard” form of the light-dependent reactions), electrons are removed from water and passed through PSII and PSI before ending up in NADPH. This process requires light to be absorbed twice, once in each photosystem, and it makes ATP .
Detailed explanation-3: -Answer and Explanation: The correct answer is option C. The light-dependent reaction of photosynthesis does not use ATP and NADPH in any of its processes.
Detailed explanation-4: -The energy generated by the hydrogen ion stream allows ATP synthase to attach a third phosphate to ADP, which forms a molecule of ATP in a process called photophosphorylation.