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    11 20 leaves 11 20 leaves Presentation Transcript

    • Do NowWhat does photosynthesis produce?What are the reactants of photosynthesis?What is the difference between autotrophs and heterotrophs?What is the formula for photosynthesis?
    • Objective: Howdo leaves get the molecules needed to carryout photosynthesis?
    • Photosynthesis equation: Where do we get themolecules we need to make it happen?Light +
    • Lets look at the whole plant… Thethree major organs are: 1. Leaf 2. Stem 3. Root
    • So we need sunlight… Predict: Where do you think the best place to get sunlight on a plant is?
    • Think of leaves like mini-solar panels that collect light…They provide a tremendous amount of area to collectphotons (what’s a photon?)…and look where these three leaves originate from…
    • Organs of the plant: Leaf Collect sunlight Exchanges oxygen and carbon dioxide via stomata Lots of chloroplasts so lots of photosynthesis
    • Photosynthesis equationLight +
    • Organs of the plant: Stem Supports plant body Transports nutrients Helps compete for sunlight  Produces leaves, branches  Tall plants hold a plants leaves up to sun
    • Organs of the plant: Root Absorbs water, dissolved nutrients from soil Branching network to seek water Anchors the plants
    • Photosynthesis equationLight +
    • How does the air get into the cell…how do we get CO2? Stomata (stoma) Pores underneath leaves Openings allowingOxygen/CO2 in Guard Cells Control the opening ofstomata based onwater availability Stomata Guard Cells
    • Regents Review In the leaf of a plant, guard cells help to1. destroy atmospheric pollutants when they enter the plant2. regulate oxygen and carbon dioxide levels3. transport excess glucose to the roots4. block harmful ultraviolet rays that can disrupt chlorophyll production
    • How does the air get into the cell…how do we get CO2?NOTE: Plants keep stomataopens just enoughto allow photosynthesis;if they leave them openedtoo much, water willevaporate out of them Stomata Guard Cells
    • Regents Review Predict an environment when guard cells would remain opened. Predict an environment when guard cells would remain closed.
    • Key IdeaThe changes inopenings in the leavesof plants – stomata –by guard cells regulatewater loss and gasexchange, carbondioxide and oxygen. Stomata Guard Cells
    • Regents Review An inorganic molecule required by green plants for the process of photosynthesis is1. oxygen2. starch3. carbon dioxide4. glucose
    • Regents Review This change directly helps to1. increase heterotrophic nutrition2. absorb minerals3. regulate water loss4. reduce seed production