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Provides Energy to make LIFE possible!
Photosynthesis Provides Energy to make LIFE possible!
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What is Photosynthesis?
Photosynthesis is a chemical reaction in which light energy is converted to chemical energy (stored in glucose). Photosynthesis = chemical reaction Light E Chemical E (stored in glucose) Living things can eat glucose, we can't eat sunlight.
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Why is Photosynthesis important?
Converts Energy into a form that makes LIFE possible! Living things can't eat sunlight, but they can eat glucose!
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Who carries out photosynthesis?
Autotrophes containing the green pigment, chlorophyll. This includes: The plant kingdom, “Half" of the Protista (the algae) “Half" the Moneran Kingdom (the blue-green algae).
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Where does photosynthesis occur?
Most photosynthesis is occurring in the oceans! (The ocean covers 70% Earth) leaves of plants. chloroplasts
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How can we summarize photosynthesis?
In words: carbon dioxide + water + light energy glucose + oxygen + water As a chemical reaction: CO2 + H2O + light energy C6H12O6 + O2 + H2O
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What raw materials are needed for the process of photosynthesis?
chlorophyll Sunlight water carbon dioxide
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How does the structure of a plant help maintain homeostasis?
Sunlight Absorbed by the chlorophyll in each chloroplast! Chloroplasts are found in the Palisade layer of a leaf!
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CO2 diffuses in through the stomata
O2 diffuses out through the stomata
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H2O is taken in through the xylem tissue
H2O transpires (exits) through the stomata
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Glucose produced during photosynthesis is pushed through the phloem to other parts of the plant that needs food!
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Reactants of Photosynthesis
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Products of Photosynthesis
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More in-depth… Inside a chloroplast…Light Dependent Reaction
Thylakoids are arranged in stacks called grana. The chlorophyll inside the grana absorbs light – blue and red. Water and O2 is absorbed. ATP is produced.
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Light Independent Reaction (Dark Reaction) (Calvin Cycle)
Uses CO2 and ATP to produce high energy sugar. ADP ATP
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Factors that affect the rate of photosynthesis…
Amount of water available Temperature (Enzymes! 0-35 °C) Intensity of light (not too much, not too little!)
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How do plants maintain homeostasis?
Cuticle – prevents water loss guard cells
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Exactly why is photosynthesis so important?
Two big reasons: glucose (sugar) oxygen
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What else is so great about sugar?
Dehydration synthesis = cellulose starch
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To which "life function" is photosynthesis related?
nutrition, autotrophic nutrition Nutrition = how organisms obtain the materials necessary for energy, growth, etc. Autotrophic Nutrition
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What else should we remember about photosynthesis?
Oxygen-Carbon Dioxide Cycle. oxygen factories removing CO2 from the atmosphere. Increasing levels of CO2 = increasing global temperature ("Global Warming") Damaging the ecosystems where photosynthesis occurs (i.e. the rainforests, the oceans)… Reduces O2 being produced Reduces CO2 being removed
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Energy formed stored in bonds of ATP (adenine triphosphate)
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