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Photosynthesis

This overview explores the essential process of photosynthesis, detailing the roles of chlorophyll and pigments in light absorption. Chlorophyll absorbs red and blue light while reflecting green, whereas carotene, xanthophyll, and anthocyanin provide color diversity. The two main reactions are the light reaction, occurring in the thylakoids and generating oxygen and ATP, and the light-independent reaction (Calvin Cycle), taking place in the stroma to convert CO2 into glucose. These processes reveal how plants produce energy and contribute to human society.

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Photosynthesis

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  1. Photosynthesis

  2. Basic Photosynthesis Write an equation with all the words in this picture.

  3. Chlorophyll Pigments that absorbs light. Also… Carotene (orange) Xanthophyll (yellow) Anthocyanin (blue/purple)

  4. Chlorophyll absorbs red and blue light, while reflecting green

  5. Chlorophyll a vs. b They complement each other. Shade of green is dependent on ratio of a to b.

  6. Intermission

  7. Two Reactions • Light Reaction • Dark Reaction • Also known as Light Independent Reaction • Also known as the Calvin Cycle

  8. Light Reaction • Occurs in the granum (on the thylakoid (in the lumen (where chlorophyll is))). • Light splits water to make oxygen, a proton, and ATP. • Equation: 12H2O + 12NADP + 18ADP → 6O2 + 12NADPH + 18ATP

  9. Light Independent Reaction • Occurs in stroma • ATP and H+ are used to turn CO2 into glucose. • Equation: ATP + NADPH + CO2 C6H12O6 + ADP + NADP

  10. Starch • Glucose is stored as starch (carbohydrate) • Examples of starch include:

  11. “Every violation of truth is not only a sort of suicide in the liar, but is a stab at the health of human society.” Ralph Waldo Emerson (1803-1882)

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