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Review Q’s
1. What is the chemical equation for photosynthesis?
2. What organelle and pigment are esponsible for the
photo...
Topic 3.8 – Photosynthesis
3.8.1
Photosynthesis is the process used by autotrophs to convert
light energy into chemical energy in the form of glucose...
3.8.2-3
Sunlight consists of many wavelengths of light, but
chlorophyll pigments power photosynthesis by absorbing
the red...
Within the chloroplast, chlorophyll a absorbs the blue and
red portions of the spectrum while chlorophyll b absorbs
higher...
3.8.4
Experiment
showing
chlorophyll
absorbance
3.8.5
Photosynthesis occurs in two primary steps referred to as
the light-dependent & light-independent reactions.
3.8.5
The light-dependent stage takes place in the granum of the
chloroplast, where light energy is used to split water
(p...
3.8.6
The ATP and H+ ions used to fix* CO2 molecules to
sugar molecules in the light-independent reaction.
In total, 6 CO2...
3.8.6
3.8.6
Direct Measurement
Since it produces oxygen, the
rate of photosynthesis can be
determined by observing the
amount of bubbl...
Indirect Measurement
Photosynthetic rate can also be
measured by measuring the
biomass of the plant over time as
well as a...
The following are needed for photosynthesis to
occur, so altering them will change the photosynthetic
rate.
• Chlorophyll
...
Light Intensity
Once the chlorophyll
pigments are saturated with
light, the photosynthetic
rate can no longer increase.
Te...
CO2 Concentration
When the reaction has
been saturated with
chlorophyll, the rate can
not increase. However, it
increases ...
Limiting Factors Graphs
3.8
3.8.1
State that photosynthesis involves the conversion of
light energy into chemical energy
3.8.2
State that light fr...
3.8
3.8.6
State that ATP and hydrogen (derived from the
photolysis of water) are used to fix carbon dioxide to
make organi...
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3.8 biochemistry - photosynthesis

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3.8 biochemistry - photosynthesis

  1. 1. Review Q’s 1. What is the chemical equation for photosynthesis? 2. What organelle and pigment are esponsible for the photosynthesis process? 3. Outline the absorption of red, blue and green light in photosynthesis. 4. What are the two primary phases of the photosynthesis process. 5. Draw and label a diagram of a dicot leaf.
  2. 2. Topic 3.8 – Photosynthesis
  3. 3. 3.8.1 Photosynthesis is the process used by autotrophs to convert light energy into chemical energy in the form of glucose sugars. 6H20 + 6CO2  C6H12O6 + 6O2 In plants, chlorophyll pigments in the chloroplasts absorb energy from light and use it to catalyze a series of reactions.
  4. 4. 3.8.2-3 Sunlight consists of many wavelengths of light, but chlorophyll pigments power photosynthesis by absorbing the red and blue portions of the visible light spectrum. Recall that we are only able to see light that is reflected (not absorbed) by an object. Therefore green plants do not absorb green light.
  5. 5. Within the chloroplast, chlorophyll a absorbs the blue and red portions of the spectrum while chlorophyll b absorbs higher wavelength blues. The green portion of the spectrum is NOT absorbed by any of the chlorophyll molecules. 3.8.4
  6. 6. 3.8.4 Experiment showing chlorophyll absorbance
  7. 7. 3.8.5 Photosynthesis occurs in two primary steps referred to as the light-dependent & light-independent reactions.
  8. 8. 3.8.5 The light-dependent stage takes place in the granum of the chloroplast, where light energy is used to split water (photolysis) into H+ ions, O2, and e-. The H+ ions are then used to synthesis ATP via a chemical gradient. The O2 is released as a byproduct. H+ ions and ATP are used in the ‘dark’ reaction.
  9. 9. 3.8.6 The ATP and H+ ions used to fix* CO2 molecules to sugar molecules in the light-independent reaction. In total, 6 CO2 are needed in order to create one glucose. *Fix = taken from the air and used to make organic
  10. 10. 3.8.6
  11. 11. 3.8.6
  12. 12. Direct Measurement Since it produces oxygen, the rate of photosynthesis can be determined by observing the amount of bubbles that plants produce over time. You can also measure the amount of available CO2 in an enclosed space since it is consumed as photosynthesis occurs. 3.8.7
  13. 13. Indirect Measurement Photosynthetic rate can also be measured by measuring the biomass of the plant over time as well as any changes in the inorganic matter that the plant uses to grow. The biomass weight can be determined by dehydrating the plant and measuring the dry mass. 3.8.7
  14. 14. The following are needed for photosynthesis to occur, so altering them will change the photosynthetic rate. • Chlorophyll • Light • Carbon Dioxide • Water • Suitable temperature These are limiting factors. 3.8.8
  15. 15. Light Intensity Once the chlorophyll pigments are saturated with light, the photosynthetic rate can no longer increase. Temperature Low temperatures will prevent the photosynthesis from occurring. Too high will denature the proteins involved. 3.8.8
  16. 16. CO2 Concentration When the reaction has been saturated with chlorophyll, the rate can not increase. However, it increases up to that point. 3.8.8
  17. 17. Limiting Factors Graphs
  18. 18. 3.8 3.8.1 State that photosynthesis involves the conversion of light energy into chemical energy 3.8.2 State that light from the sun is composed of a range of wavelengths (colors). 3.8.3 State that chlorophyll is the main photosynthetic pigment. 3.8.4 Outline the difference in absorption of red, blue and green light by chlorophyll. 3.8.5 State that light energy is used to produce ATP, and to split water molecules (photolysis) to form oxygen and hydrogen.
  19. 19. 3.8 3.8.6 State that ATP and hydrogen (derived from the photolysis of water) are used to fix carbon dioxide to make organic molecules. 3.8.7 Explain that the rate of photosynthesis can be measured directly by the production of oxygen or the uptake of carbon dioxide, or indirectly by an increase in biomass. 3.8.8 Outline the effects of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis.

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