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Photosynthesis - PowerPoint PPT Presentation


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Photosynthesis. Photosynthesis Overview. Defined : Production of sugar & oxygen from CO2, water, & sunlight Endergonic reaction: Requires energy Who : Plants, algae, some bacteria End Result : Sugar for food and oxygen (waste) 2 step process. Step 1 : Light Reaction.

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PowerPoint Slideshow about ' Photosynthesis' - teagan-stephens


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Presentation Transcript
photosynthesis overview
PhotosynthesisOverview
  • Defined: Production of sugar & oxygen from CO2, water, & sunlight
  • Endergonic reaction: Requires energy
  • Who: Plants, algae, some bacteria
  • End Result: Sugar for food and oxygen (waste)
  • 2 step process
step 1 light reaction
Step 1: Light Reaction
  • Where: Thylakoid membranes of chloroplast
  • What happens?
    • 1) Light energy converted into chemical energy (ATP)
    • 2) Water (H2O) broken apart and the oxygen is released as a waste product
  • How: Chlorophyll absorbs light energy and electrons become excited
    • Excited electrons bond ADP + P to create ATP
  • Sunlight energy has been converted into chemical energy (ATP)
  • No sugar created…yet!!!
step 2 dark reaction
Step 2: Dark Reaction
  • Where: Stroma (fluid interior) of chloroplast
  • What happens? ATP (from light reaction) creates sugars
  • How?
    • ATP breaks apart CO2 + H2 from water
    • Atoms recombine into glucose and other sugars
  • Sugar is used by plants, algae, and some bacteria as a food source (autotrophs)
the big picture
The Big Picture
  • Reasons I love autotrophs!
    • All food energy on earth can be traced back to photosynthesis
    • Autotrophs absorb CO2
  • Problem: Greenhouse Effect
    • The Good: GHE naturally warms Earth by trapping heat
    • The Bad: CO2 from fossil fuels traps excess heat near Earth’s surface
    • AKA: Global Warming
  • Solutions: Regrow plants to absorb the extra CO2, reduce use of fossil fuels
quick review
QuickReview
  • CO2, Water, Sunlight are used during photosynthesis
  • Sugar and Oxygen are created as a result of photosynthesis
  • Photosynthetic life forms the basic of life on earth
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