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Photosynthesis

Photosynthesis. Yr 11 Biology Miss Brunott. http://www.fun-with-science.com/fun_wi7.gif. What is Photosynthesis?. Involves the process where light energy from the sun is converted into chemical energy. Carbon from CO 2 is fixed into organic compounds (glucose). .

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Photosynthesis

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  1. Photosynthesis Yr 11 Biology Miss Brunott http://www.fun-with-science.com/fun_wi7.gif

  2. What is Photosynthesis? • Involves the process where light energy from the sun is converted into chemical energy. • Carbon from CO2 is fixed into organic compounds (glucose).

  3. http://grapevine.net.au/~grunwald/une/KLAs/science/irrigation-photosynthesis.gifhttp://grapevine.net.au/~grunwald/une/KLAs/science/irrigation-photosynthesis.gif

  4. Equation for Photosynthesis Sunlight 6CO2 + 6H2O  C6H12O6 + 6O2 Chlorophyll

  5. Light Spectrum of Photosynthesis • Normal light is a mixture of wavelengths represented by seven colours – ROY G BIV.  • Most plants are green as green light is reflected off them.   • Plants contain the green pigment chlorophyll – use the blue and red wavelengths of the light spectrum.

  6. http://www.sciencebuddies.org/mentoring/project_ideas/HumBeh_img019.gifhttp://www.sciencebuddies.org/mentoring/project_ideas/HumBeh_img019.gif

  7. Step 1: Light Dependent Reactions • The chlorophyll pigments absorb light energy. • The energy excites electrons and releases it from the molecule.   • The electron is used for producing ATP and break water molecules into hydrogen and oxygen molecules.

  8. Step 1: Light Dependent Reactions • The oxygen is released as a waste from the plant.   • Once electrons have used their energy, return back to chlorophyll molecules.

  9. Step 2: Light-Independent Reactions • Takes place in the stroma.   • Does not require light.  • Require the products of light-dependent reactions.   • The hydrogen (from light-dependent) combines with CO2 (from atmosphere).  • Uses ATP energy and produces glucose.

  10. Complexity of Photosynthesis http://fig.cox.miami.edu/~cmallery/150/phts/c8.10x21.overview.jpg

  11. http://www.daviddarling.info/images/photosynthesis1.gif

  12. Factors Affecting Photosynthesis • Photosynthesis stops or slows down if the conditions are quite right. • A limiting factor is something that stops photosynthesis from happening any faster. • Limiting factors depend on environmental factors – climate etc.

  13. Factors Affecting Photosynthesis • Light Intensity • Increase light – increase photosynthesis • Only 1% of light is used • Temperature • Increase Temperature – increase photosynthesis • Max 40 degrees

  14. Factors Affecting Photosynthesis • Water • Decrease water cause stomata to close  no CO2 will enter • Carbon Dioxide • Increase CO2, increases photosynthesis • Reaches a compensation point

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