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Energy and the Biosphere
Producers are the basis of all ecosystems on the planet!
Ecosystem: all of the living and nonliving factors that exist together in
a particular environment.
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How is energy transferred through an ecosystem: 10% Rule
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Productivity
• The amount of energy plants capture and make available to a given ecosystem.
• Which is more productive--A rainforest or a desert?
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How is the sun’s energy captured?
• Photosynthesis:– Process producers use
to transfer energy from sunlight into chemical energy (glucose)
– This process UNITES all photosynthetic producers!
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Diversity of photosynthetic organisms
• Cyanobacteria• Algae
– Phytoplankton (single celled
– Multicellular Algae
• Moss• Fern• Gymnosperms (pines)• Angiosperms (flowering plants)
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Cladogram
• Shows relationship of true plants to algae ancestor.
• What would the common ancestor of both plants and algae be similar to?
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Structure meets function in plants
• Plant organs--Observe your plant organ and see if you can describe– Structure
– Function
– How structure meets function
Flowers, roots, stems, leaves!!!
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Flowers
• Function: Reproduction
• Structure meets function: Attractive petals entice pollinators
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Roots
• Functions– Take in water
– Store sugar
• Structure Meets Function: root hairs increase surface area for absorption
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Stems
• Functions:– Transport water up (xylem)
sugar down (phloem)– Can be modified for storage
(potatoes)
• Structure meets function:– Filled with tubes that allow
cohesion and adhesion of water (xylem)
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Leaves
• Function: Photosynthesis• Structure meets function: contains specialized
mesophyll cells that have chloroplasts. Also waxy cuticle keeps leaf from getting waterlogged.
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Photosynthesis Equation
• What must the plants have to capture the energy of sunlight and therefore allow this reaction?
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Chlorophyll
• Absorption• Reflection
• A red shirt absorbs blue and green light and reflects red light!• What type of light energy does chlorophyll absorb?
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Organization of the Photosynthesis Reaction
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Organization within the Chloroplast
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Thlakoid: Membrane containing chlorophyll. Location of the light reactions
Stroma: Cytoplasm of chloroplast. Location of Calvin Cycle
What is the role of the light reactions
• Charge up ATP battery• Needs light and
chlorophyll• Uses the splitting of
water to provide electrons to run an electron transport chain and make ATP
• Waste product is oxygen gas!
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What is the role of the Calvin Cycle?
• Add the H’s from water to the CO2 gas plants take in and make sugar!
• A 3-carbon sugar is made; two combine to make C6H12O6-glucose!
• Does not need light!
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In your own words…
• Describe producers transfer light energy into chemical energy.
• A proficient answer discusses both the plant and what is happening in the chloroplast
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Interactions between organisms within an ecosystem
• A biological community are all of the living things interacting in an ecosystem.
• Food webs display this interaction.
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Food web--How are these organisms related?
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Identify:
Producer
Primary Consumer
Secondary Consumer
Tertiary Consumer
Decomposer
Transfer of Energy
• What is the significance of the way the arrows point?
• Identify 3 transfers of energy/matter:– Photosynthesis
– Respiration
– Decomposition
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Compare and Contrast
• Compare and contrast photosynthesis and respiration.
• Make sure to include– Organism level
– Ecosystem level
– Cellular level
– Examples both structure and function
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