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Photosynthesis

Photosynthesis. Introduction/Basic Info Furlow Novi High School. Photosynthesis. Essential for all life on earth. Autotrophs. Photosynthesis. CO 2. Glucose (only an example). Respiration. Consumers. Photosynthesis. So how do we actually see different colors?.

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Photosynthesis

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  1. Photosynthesis Introduction/Basic Info Furlow Novi High School

  2. Photosynthesis Essential for all life on earth Autotrophs Photosynthesis CO2 Glucose (only an example) Respiration Consumers

  3. Photosynthesis So how do we actually see different colors? • The wavelength of the light will determine the color of the light

  4. Photosynthesis When light waves are absorbed from this region of the visible spectrum it can be used by a plant • Green leaves look green because they have a pigment that does not absorb green light, it reflects it

  5. Photosynthesis

  6. Photosynthesis The main light absorbing pigment in green plants is chrorophyll—found inside the chloroplasts • Like a mitochondrion, the structure of the chlorophyll is directly related its function (common theme in bio) • Have their on DNA in a ring, ribosomes (70S), an inner and outer membranes • Only actual green structures in a plant

  7. Photosynthesis starch granule Ribosomes in stroma Stoma lamellae

  8. Photosynthesis Chlorphyll is a green pigment • Reflects green wavelengths of light, in the middle of the VS, absorbs non-green wavelengths • Blue and red regions are absorbed the most • Absorption spectra show which wavelengths are absorbed as a function of O2 production

  9. Photosynthesis

  10. Photosynthesis Two stages of photosynthesis: light independent and light dependent • Different sets of reactions used in each stage • Light dependent produces ATP and allows photolysis to occur (O2 is a waste product) • Light independent allows for carbon fixation

  11. Photosynthesis—Light dependent Chlorophyll, and other pigments, absorb light from the sun (or other source) • Energy from absorbed wavelengths produces ATP • Light also used to split water into H2 and O2 (photolysis) • Released O2 is source of aerobic respiration; ATP and H2 used by the plant

  12. Photosynthesis—Light dependent light O2 water electrons Light dependent reactions Chlorophyll and other photosynthetic pigments ATP H+ • ATP production very similar to that of respiration w/ most energy being acquired via an electron transport chain H2

  13. Photosynthesis—Light independent ATP and H2 generated from light dependent stage used to covert CO2 and H2O into organic compounds (like glucose) • 6CO2 + 6H2O C6H12O6 + 6O2 • This carbon fixation…turning inorganic to organic • Fixation requires energy—all comes from sun

  14. Photosynthesis • 6CO2 + 6H2O C6H12O6 + 6O2 • C6H12O6 + 6O2 6CO2 + 6H2O RESPIRATION!!!! • Plants do both…photosynthesis and respiration • Respiration occurs at a slow, steady rate, regardless of light/dark = small yields of ATP. Why? • No muscle, large movement, or other energy requiring processes…less ATP needed vs animals

  15. Photosynthesis-rates • Photosynthesis does not occur at such a steady rate • Greatly affected by intensity of light, temperature, and CO2 levels • Can be measured directly via CO2 intake and O2 production amounts IF adjusted to account for respiration • Biomass (amount of plant/size) is an indirect method of measuring rate of photosynthesis—indirect b/c a lot of other potential factors

  16. Photosynthesis-rates O2 released + Photosynthesis 0 Respiration O2 taken in -- Day 1 Night 1 Day 2 Night 2

  17. Photosynthesis-rates • Light intensity—varies inversely with the square of the distance (farther away, less intense) Enzymes at max rate Rate of photosynthesis intensity

  18. Photosynthesis-rates • Temperature Enzymes and other proteins begin to get denatured Rate of photosynthesis Temp

  19. Photosynthesis-rates • CO2 concentration Plateaus unless light intensity or temp. go up Rate of photosynthesis CO2

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