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PHOTOSYNTHESIS Energy is used to make: Proteins Sugars Fats

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Presentation on theme: "PHOTOSYNTHESIS Energy is used to make: Proteins Sugars Fats"— Presentation transcript:

1 PHOTOSYNTHESIS Energy is used to make: Proteins Sugars Fats
Nucleic acids All living things need energy. Energy comes from sun.

2 PHOTOSYNTHESIS Energy is harnessed:
Producers (plants) are able to convert this light energy (sunlight) into chemical energy (sugar).

3 PHOTOSYNTHESIS EQUATION: Carbon Water Sugar Oxygen Water Dioxide 6 CO2
Sunlight chlorophyll 6 CO2 + 12 H2O C6H12O6 + 6 O2 + 6 H2O

4 CHLOROPLASTS All cells in leaves have thousands of green organelles called chloroplasts.

5 CHLOROPLASTS Stroma: Cytoplasm of chloroplast; contains enzymes for making sugar Thylakoid: Flattened sacs; convert light NRG to chemical NRG Grana: Stacks of thylakoids

6 CHLOROPHYLL Molecule that absorbs sunlight energy. Photoreactive core

7 SUNLIGHT What do you think would happen if you placed a plant in just green light? Plants appear to be green because chlorophyll does not absorb green wavelengths of light. Just blue light?

8 HOW DOES A CHLOROPLAST WORK?
A. Light reaction Sunlight is absorbed by chlorophyll in thylakoid. This energy is used to split water. 2 H2O O2 + 4 H electrons 3. Oxygen is produced. 4. Electrons are excited (contain super energy). 5. No carbon dioxide is used; no sugar is produced.

9 HOW DOES A CHLOROPLAST WORK?
Light reactions harness sunlight to split water, produce oxygen, and excite an electron. Occurs in thylakoids.

10 HOW DOES A CHLOROPLAST WORK?
B. Dark Reaction (Calvin Cycle) Enzymes in stroma use the excited electron’s energy to build sugar from CO2 and H+. DOES NOT REQUIRE DARKNESS, BUT CAN HAPPEN IN DARK BUT . . . Only if there are enough excited electrons. Once those run out – photosynthesis is done.

11 Leaf Structure Cuticle – waxy layer on top of leaf

12 Leaf Structure Epidermis – outermost layer of cells

13 Leaf Structure Upper epidermis Lower epidermis

14 PALISADES

15

16 Leaf Structure Palisade layer – “tall” cells; primary site of photosynthesis in leaf (many chloroplasts)

17 Leaf Structure Spongy layer – cells are not tightly packed; room for gas exchange; some chloroplasts

18 Leaf Structure Guard cells – form openings to allow gases and water to enter/leave leaf; some chloroplasts

19 Leaf Structure Stomata –openings formed by guard cells

20 Leaf Structure Xylem – transport of water

21 Leaf Structure Phloem – transport of sugar


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