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Understanding Photosynthesis Process in Plants

Learn about photosynthesis, the process plants use light energy to produce glucose. Explore the chemical equation, reactants, chloroplasts, energy sources, pigments, and more. Absorption of light by chlorophyll explained.

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Understanding Photosynthesis Process in Plants

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  1. Photosynthesis • Process of plants using light energy to produce glucose • To put together using light

  2. Chemical Equation • CO2 + H2O  C6H12O6 + O2 • Requires light • Requires chloroplasts

  3. Reactants • CO2 + H2O

  4. Carbon Dioxide (CO2) • About .03% of the atmosphere • Sources • Respiration • Burning • Decomposition • Enters plant leaf through stomate

  5. Water (H2O) • Enters the plant root system (root hairs) by osmosis • Travels through xylem from the roots to the leaves • Transpiration- evaporation of water from leaves

  6. Energy • Light- small portion of the EM spectrum • ROY G. BIV • Blue, Violet, Red used most by leaf

  7. Chloroplasts • Photosynthetic organelles found in certain leaf cells, contains the pigments

  8. Primary Pigments • Visible during the growing seasons • chlorophyll a- green • chlorophyll b- green

  9. Secondary Pigments • Not visible during the growing season • Hidden by the primary pigments • Become visible in the fall of the year

  10. Secondary Pigments • Carotenoids • Carotene- orange • Xanthophyll-yellow • Anthocyamin- red

  11. Chloroplast Structure • Grana- stack of tiny discs, contain the chlorophyll • light reactions take place here, light is required

  12. Chloroplast Structure • Stroma- contains enzymes • dark reactions take place here, light not required

  13. Products • C6H12O6 + O2

  14. Glucose (C6H12O6) • Formed in the chloroplasts • Transported through vessels called phloem • Stored as carbohydrates in roots, stems, leaves, fruit, seeds, etc

  15. Oxygen (O2) • Released through the stomata into the atmosphere

  16. Absorption of Chlorophyll P 115, Figure 6-5 1. Look at chlorophyll a, what color of light is absorbed the most? What is its wavelength? 2. Look at chlorophyll b, what color of light is absorbed the most? What is its wavelength?

  17. Absorption of Chlorophyll 3. Look at the carotenoids, what color of light is absorbed the most? What is its wavelength? 4. Why are there no peaks between 540 nm and 640 nm?

  18. Absorption of Chlorophyll 5. What colors are reflected most by the pigments? 6. Arrange the colors in the spectra for chlorophyll a & b in the order of their visiblity. List the most visible 1st

  19. Absorption of Chlorophyll 1. chlor. a abs- violet, 425 nm 2. chlor. b abs- blue, 460 nm 3. carot. Abs- blue-green, 475 nm 4. The colors are being reflected. 5. refl. most- green, yellow, orange 6. order of visibility- green, yellow, orange, red, violet, blue

  20. All images- Clip Art

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