11/19 leaves
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11/19 leaves

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11/19 leaves 11/19 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?
  • Photosynthesis equationLight +
  • Aim: Where does photosynthesis occur?
  • So we need sunlight… 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…
  • Leaf structure Itis optimized for absorbing light and carrying out photosynthesis Blade  Collect sunlight  Thin, flattened sections Petiole  Connects blade to stem stem
  • Inside a leaf - Epidermis Leavesare covered on top and bottom by an epidermis layer  Irregular, tough cells
  • Inside a leaf - Cuticle The epidermis is also covered by a waxy cuticle layer  the epidermis/cuticle the leaf forms a waterproof layer that protects from losing water
  • Inside a leaf - Mesophyll The bulk of the leaf is composed of mesophyll cells  Packed with chloroplasts; photosynthesis happens here
  • Palisade Mesophyll Layer Under the upper Epidermis tall column-shaped cells absorb most of the lightPalisade mesophyll layer
  • Spongy Mesophyll Layer Beneath the palisade loosely packed lots of air within the mesophyll layerSpongy mesophyll layer
  • Label your chart on the back
  • How does the air get into the cell…how do we get CO2? Stomata (stoma) Pores underneath Openings allowingOxygen/CO2 in Guard Cells Control the opening ofstomata based on waterpressure Specialized dermis cells Stomata Guard Cells
  • 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
  • Guard cells and stomataGuard cells help plantsmaintain CO2 balance.What word comes to mindwhen we talk aboutInternal balance? Stomata Guard Cells
  •  An inorganic molecule required by green plants for the process of photosynthesis is1. oxygen2. starch3. carbon dioxide4. glucose
  •  Which activity occurs in the process of photosynthesis?1. Chemical energy from organic molecules is converted into light energy.2. Organic molecules are obtained from the environment.3. Organic molecules are converted into inorganic food molecules.4. Light energy is converted into the chemical energy of organic molecules.
  •  Photosynthesis is the process by which1. the potential energy of simple sugars is transferred to ATP molecules2. simple sugars are gradually broken down to form lactic acid or alcohol3. two simple sugar molecules combine to form maltose and water4. light energy is converted into the chemical energy of simple sugars
  •  The mass of some corn plants at the end of their growth period was 6 tons per acre. Most of this mass was produced from1. water and organic compounds absorbed from the soil2. minerals from the soil and oxygen from the air3. minerals and organic materials absorbed from the soil4. water from the soil and carbon dioxide from the air
  • Quiz!
  • Citations Allpictures taken from Google pictures/PowerPoint clipart