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Stages of photosynthesis. When chlorophyll a absorbs light energy, an electron gains energy and is 'excited'. The excited electron is transferred to another molecule (called a primary electron acceptor). The chlorophyll molecule is oxidized (loss of electron) and has a positive charge.
PHOTOSYNTHESIS: • converts light energy to the chemical energy of food 6CO2 + 6H2O + light energy C6H12O6 + 6O2. Happens in all green parts of plants but leaves = major site ~ about half a million chloroplasts/mm2 of leaf surface. Color of leaf due to green pigment chlorophyll.
The Light-Dependent Reactions: Generating ATP and NADPH. Photosynthesis begins with these reactions, which occur in thylakoid membranes. Photosystems are clusters of proteins and chlorophyll in thylakoid membranes. High-energy electrons form when pigments in photosystem II absorb light.
Students should be able to: 1.2.1 demonstrate knowledge and understanding of photosynthesis as an endothermic process that takes place in chloroplasts, where chlorophyll absorbs light energy, producing sugars and starch; 1.2.2 recall the word equation for photosynthesis.
1. Raw materials for photosynthesis are carbon dioxide and water. 2. Roots absorb the water and move it up vascular tissue in the stem until it reaches the leaf veins. 3. Carbon dioxide enters a leaf through small openings called stomata. 4. Carbon dioxide and water then diffuse into the chloroplasts, organelles that carry on photosynthesis. 5.
Photosynthesis is not a single process, but two processes, each with multiple steps. Explain what occurs in the light reactions stage of photosynthesis. Be sure to use NADP+ and photophosphorylation in your discussion. Explain the Calvin cycle, using the term carbon fixation in your discussion. 6.
In other words, the reaction center chlorophyll molecules transfer electrons with their absorbed energy rather than just transferring the energy (as the antenna chlorophyll molecules do). This electron transfer is the step in photosynthesis that converts light energy into electrical energy.
