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Multiple Choice
What is the primary function of the light reactions in photosynthesis?
A
To produce glucose from carbon dioxide and water
B
To release oxygen as a byproduct of water splitting
C
To fix carbon dioxide into organic molecules
D
To convert solar energy into chemical energy in the form of ATP and NADPH
Verified step by step guidance
1
Understand the context of photosynthesis: Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.
Identify the two main stages of photosynthesis: The light reactions and the Calvin cycle (dark reactions). The light reactions occur in the thylakoid membranes of chloroplasts and require sunlight.
Recognize the primary function of light reactions: The light reactions convert solar energy into chemical energy. This is achieved by producing ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), which are energy carriers.
Explain the mechanism: During the light reactions, chlorophyll absorbs sunlight, exciting electrons that are transferred through a series of proteins in the electron transport chain. This process generates ATP and NADPH.
Clarify the role of ATP and NADPH: These molecules are then used in the Calvin cycle to fix carbon dioxide into organic molecules, ultimately leading to the synthesis of glucose.