Photosynthesis
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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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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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