Photosynthesis -...
Transcript of Photosynthesis -...
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Photosynthesis
Big Idea #2: Energy is needed to do stuff.
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Essential Knowledge
• 2A2: Organisms capture and store free energy for use in biological
processes.
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Producers: Phototrophs• Use free energy solar radiation to produce
sugar (PS)• Plants, Algae (Phytoplankton), Cyanobacteria
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Producers: Cyanobacteria• Bacteria that can photosynthesize
• Are the only photosynthetic prokaryotes able to produce oxygen.
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PS Occurs in Chloroplasts
⚫ Found in all green parts
⚫ Most abundant in mesophyll cells
⚫ Chlorophyll: green pigment that captures free energy sunlight.
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Chloroplast Structure•Thylakoids are
membrane-bound discs (chlorophyll)
•Outside fluid is called the stroma
•Contained in a double membrane
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Chloroplast x5,755
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• Capture free energy from small inorganic molecules (H2S) to produce sugars
(chemosynthesis)
• Can occur w/out O2.
• Bacteria
Producers: Chemotrophs
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Evolution of PS
• Started in prokaryotic cells (bacteria) and created an oxygenated atmosphere.
• rRNA analysis
• Made foundation for eukaryotic PS.
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Photosynthesis
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Steps of PS•Light hits reaction centers of chlorophyll in Photosystems II and I; found in chloroplasts
•Chlorophyll vibrates and causes water to break apart.
•Oxygen is released into air through stomata.
•Hydrogen remains in chloroplast attached to NADPH
•“THE LIGHT REACTION”
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In Order to Fuel This Process..
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•The DARK Reactions= Calvin Cycle
•CO2 from atmosphere is joined to H from water molecules (NADPH) to form glucose (Carbon Fixing) w/ help of enzyme Rubisco
•Glucose can be converted into other molecules w/ good flavors.
Steps of PS
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Types of Plant Reproduction
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Plant Hormone AUXIN Bends Plant To Sun → Phototaxis
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Plant Review WS
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Review of Calvin Cycle
⚫ http://www.science.smith.edu/departments/Biology/Bio231/calvin.html
⚫ http://www.youtube.com/watch?v=OYSD1jOD1dQ