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Photosynthesis. Refresher Question. What is a leaf’s main function?. Make food! PHOTOSYNTHESIS. Refresher Question. What plant structure do you see here:. ROOT. http://www.botgard.ucla.edu/html/botanytextbooks/generalbotany/images/typesofroots/Sonchusroots.jpg. Refresher Question.
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Refresher Question • What is a leaf’s main function? Make food! PHOTOSYNTHESIS
Refresher Question • What plant structure do you see here: ROOT http://www.botgard.ucla.edu/html/botanytextbooks/generalbotany/images/typesofroots/Sonchusroots.jpg
Refresher Question • What is the green pigment that captures light called? Chlorophyll
Refresher Question • What is the cell organelle that contains chlorophyll called? Chloroplast http://www.cbs.dtu.dk/staff/dave/roanoke/chloroplast.gif
Plant Video National Geographic Video
Photosynthesis • Plants use energy from sunlight to make food from carbon dioxide and water. 6CO2+6H2OSunlight C6H12O6+6O2 Chlorophyll • Chlorophyll • Green Color • Part of the Chloroplasts • Captures sunlight
Plant Puzzler • What is the energy source that drives photosynthesis? SUN
Sugar (Glucose) • C6H12O6 6 Carbon, 12 Hydrogen, 6 Oxygen • Glucose is stored energy • plants use for food • Made from CO2, H2O, Sunlight and chlorophyll
Plant Puzzler • The kind of food produced directly from photosynthesis is __________? Sugar = Glucose = C6H12O6
Gas Exchange in Leaves • Cuticle: waxy covering that protects plant • How does gas “break through” that tough barrier? • Stoma! (plural= stomata) • an opening in a leaf or stem that allows gas exchange • Each stoma has 2 Guard Cells • Guard Cells open or close stoma • Closed stoma = no gas exchange • Open stoma = gas exchange • Carbon Dioxide (CO2), Oxygen (O2), and Water Vapor (H2O)
Plant Puzzler • An opening in a plant that allows for gas exchange is called a __________? • What gases are transported through the stoma? Stoma CO2, O2, H2O
Question #1 • Put a plant under a dark box. • Is this plant undergoing photosynthesis? Why or why not? http://homepage.eircom.net/~pakform/bse_007-3.gif http://www.fightingquaker.com/jaropt/table_plant.jpg
Question #2 • Describe what you think will happen to the life seen here (and on Earth), after a meteor blackened the sky so that no sun could shine through?
Question #3 • Are the leaves you see here undergoing photosynthesis? Why or why not? • Pretend that the branch is still attached to the living tree.
Question #4 • If you and a large tree were locked in an airtight compartment, with plenty of food, water, and nutrients, could you survive? Explain your answer.