FATS Chapter 6 Sports Nutrition FATS The Concentrated Energy Source.
PHOTOSYNTHESIS All living things need energy. Energy comes from sun. Energy is used to make:...
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Transcript of PHOTOSYNTHESIS All living things need energy. Energy comes from sun. Energy is used to make:...
PHOTOSYNTHESISPHOTOSYNTHESIS
All living things need energy.
Energy comes from sun.
Energy is used to make:
-Proteins
-Sugars
-Fats
-Nucleic acids
PHOTOSYNTHESISPHOTOSYNTHESIS
Energy is harnessed:
Producers (plants) are able to convert this light energy (sunlight) into chemical energy (sugar).
PHOTOSYNTHESISPHOTOSYNTHESIS
EQUATION:
Carbon Water Sugar Oxygen WaterDioxide
6 CO2 + 12 H2OSunlight
chlorophyll
C6H12O6 + 6 O2 + 6 H2O
CHLOROPLASTSCHLOROPLASTS
All cells in leaves have thousands of green organelles called chloroplasts.
CHLOROPLASTSCHLOROPLASTS
Thylakoid: Flattened sacs; convert light NRG to chemical NRGGrana: Stacks of thylakoidsStroma: Cytoplasm of chloroplast; contains enzymes for making sugar
CHLOROPHYLLCHLOROPHYLL
Molecule that absorbs sunlight energy.
Photoreactive core
SUNLIGHTSUNLIGHT
Plants appear to be green because chlorophyll does not absorb green wavelengths of light.What do you think would happen if you placed a plant in just green light?
Just blue light?
HOW DOES A CHLOROPLAST HOW DOES A CHLOROPLAST WORK?WORK?
A. Light reaction
1. Sunlight is absorbed by chlorophyll in thylakoid.
2. This energy is used to split water.2 H2O O2 + 4 H+
+ 4 electrons
3. Oxygen is produced.
4. Electrons are excited (contain super energy).
5. No carbon dioxide is used; no sugar is produced.
HOW DOES A CHLOROPLAST WORK?HOW DOES A CHLOROPLAST WORK?
Light reactions harness sunlight to split water, produce oxygen, and excite an electron. Occurs in thylakoids.
HOW DOES A CHLOROPLAST HOW DOES A CHLOROPLAST WORK?WORK?
B. Dark Reaction (Calvin Cycle)
1. Enzymes in stroma use the excited electron’s energy to build sugar from CO2 and H+.
2. DOES NOT REQUIRE DARKNESS, BUT CAN HAPPEN IN DARK BUT . . .
Only if there are enough excited electrons. Once those run out – photosynthesis is done.
Leaf StructureLeaf StructureCuticle – waxy layer on top of leaf
Leaf StructureLeaf Structure
Epidermis – outermost layer of cells
Leaf StructureLeaf Structure
Upper epidermis
Lower epidermis
PALISADES
Leaf StructureLeaf Structure
Palisade layer – “tall” cells; primary site of photosynthesis in leaf (many chloroplasts)
Leaf StructureLeaf Structure
Spongy layer – cells are not tightly packed; room for gas exchange; some chloroplasts
Leaf StructureLeaf Structure
Guard cells – form openings to allow gases and water to enter/leave leaf; some chloroplasts
Leaf StructureLeaf Structure
Stomata –openings formed by guard cells
Leaf StructureLeaf Structure
Xylem – transport of water
Leaf StructureLeaf Structure
Phloem – transport of sugar