Photosynthesis

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Photosynthesis

  1. 1. Arnel, Kimberlyanne, Wendy
  2. 2. MotivationFind how the different spectrums of light affect the rate of photosynthesis in plants. If a plant is placed under a green colored light, less photosynthesis occurs compared to other colors on light spectrum.
  3. 3. What is photosynthesis?Photosynthesis is the process of converting solar energy into chemical energy.  Chloroplast a & b  e- transport chain
  4. 4. Materials 3 Beakers 3 Petri Dishes Green, Blue, and Red Food Coloring 5 Cuvettes Water Chloroplast Solution DPIP 6.5 pH Phosphate Buffer Spectrophotometer Light Source
  5. 5. Methodology 3 cuvettes containing solution were placed in separate beakers Covered with petri dish lids filled with red, blue, and green food coloring 1 cuvette was placed and covered under a large bin. 1 cuvette was placed under the normal lighting
  6. 6. … Every five minutes for twenty minutes, the cuvettes were taken from the beakers and placed into the spectrophotometer to measure the transmittance of light.
  7. 7. Setup
  8. 8. Percent Transmittance vs. TimeMinutes Control Blue (%) Red (%) Green (%) Dark (%) (%)0 21.8 35 55.8 50.6 17.25 20 65 50.2 53.2 1610 20.2 71.6 70.4 53.6 16.415 19.8 70.6 62.4 53.2 1620 19.6 70.8 69.8 53.8 16.2
  9. 9. Graph Rate of Photosynthesis 80 70Light Transmittance (%) 60 50 Blue 40 Red 30 Green 20 Dark 10 0 5 5 10 15 20 Time (minutes)
  10. 10. Blue & red light Chloroplasts contain pigments named chlorophyll a and chlorophyll b which absorb photons from the sunlight. The pigments absorb blue and red light best.
  11. 11. Green lightGreen light is reflectedBy reflecting the green, little to no sunlight is absorbed.
  12. 12. DarkDecreased due to no light being absorbed.Light is needed to create ATP and power photosynthesis.
  13. 13. Photosynthesis 

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