The electron pumping of the light reaction makes this possible, by pumping H ions into the thylakoid interior which are used to make ATP, and by NADP picking up the electrons and H ions to carry them to the dark reaction.
When the energy of ATP is used to make glucose, the third phosphate is broken off and attached to another molecule, thus transferring the energy from the ATP to the other molecule.
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The light reactions of photosynthesis are actually an electron pumping system located on the thylakoids of the chloroplast.
Quia - Photosynthesis and Respiration Vocabulary
Participants in Photosynthesis
Chloroplasts are organelles specialized for photosynthesis. Inside chloroplasts are chlorophyll, proteins which can absorb light. Photosystems are many proteins together which can gather and amplify light energy. NADPH is an energy carrier in plants and ATP synthase produces the ATP.
Photosynthesis and Respiration Vocabulary
Photosynthesis is a process where by energy from light is harvested and used to drive synthesis of organic carbohydrates from carbon dioxide and water. Photosynthesis takes place in chloroplasts and can be divided into two steps: light reactions which require light and dark reactions which do not require light. During light reaction, light energy is captured by photosystems and electrons are transferred among the electron receptors. ATP and NADPH are generated. During dark reactions, CO2 is fixed using ATP and NADPH generated by the light reactions and organic carbohydrates are synthesized via the Calvin Cycle. When the CO2 is first fixed into a 3 carbon compound 3PGA, it is called C3 pathways and these plants are called C3 plants. The disadvantage of C3 plants is that they undergo photorespiration and thus waste some energy gained in light reactions. C4 cycle is the pathway adopted by C4 plants to bypass photorespiration.
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This problem is overcome because the heterocysts contain only part of the photosynthetic apparatus,termed photosystem I, which can be used to generate energy (as ATP).
High-energy electrons move through the electron transport chain
The dark reactions serve as a sugar factory, using carbon dioxide and H atoms as raw materials to make sugar.
The light reaction trapped the solar energy and transferred it to the dark reaction via ATP so that the dark reaction had the energy to make glucose.