2006-2007
Photosynthesis: Life   from   Light  and   Air 2006-2007
Plants are energy producers <ul><li>Like animals, plants need energy to live </li></ul><ul><li>Unlike animals, plants don’...
How do plants make energy & food? <ul><li>Plants use the energy from the sun </li></ul><ul><ul><li>to make ATP energy </li...
Building plants from sunlight & air <ul><li>Photosynthesis </li></ul><ul><ul><li>2 separate processes </li></ul></ul><ul><...
Using light & air to grow plants <ul><li>Photosynthesis </li></ul><ul><ul><li>using sun energy to make ATP </li></ul></ul>...
What do plants need to grow? <ul><li>The “factory” for making  energy & sugars </li></ul><ul><ul><li>chloroplast   </li></...
Photosynthesis energy building  reactions sugar building  reactions ATP ADP sugar sun CO 2
Chloroplasts are only in plants animal cells plant cells
Chloroplasts Chloroplasts in cell Leaf Leaf Chloroplast absorb sunlight & CO 2 make energy & sugar Chloroplasts contain Ch...
<ul><li>Bring In </li></ul><ul><ul><li>CO 2 </li></ul></ul><ul><ul><li>H 2 O </li></ul></ul><ul><ul><li>light </li></ul></...
Leaf Structure phloem (sugar) xylem (water) stomate guard cell palisades layer spongy layer cuticle epidermis
Transpiration H 2 O CO 2 CO 2 O 2 H 2 O <ul><li>gases in & out </li></ul><ul><li>water out </li></ul>O 2 xylem (water) sto...
Transpiration <ul><li>Water evaporates from the stomates in the leaves </li></ul><ul><ul><li>water molecules stick to each...
Stomates  <ul><li>Function of stomates </li></ul><ul><ul><li>CO 2  in </li></ul></ul><ul><ul><li>O 2  out  </li></ul></ul>...
 
Xylem carry water up from roots
Phloem: food-conducting cells <ul><li>carry sugars around the plant wherever they are needed  </li></ul><ul><ul><li>new le...
Putting it all together  <ul><li>Making a living… </li></ul><ul><ul><li>sunlight </li></ul></ul><ul><ul><ul><li>leaves = s...
How are they connected? Respiration Photosynthesis glucose  +  oxygen    carbon  +  water  +  energy dioxide C 6 H 12 O 6...
Energy cycle Photosynthesis Cellular Respiration O 2 CO 2 plants animals ,  plants ATP H 2 O sun The Great Circle of Life!...
The poetic perspective <ul><li>All of the solid material of every  plant   was built out of thin air </li></ul><ul><li>All...
2006-2007 Got the energy… Ask Questions !!
Energy needs of life <ul><li>All life needs a constant input of energy </li></ul><ul><ul><li>Animals = Heterotrophs </li><...
How do  plants  live? <ul><li>Photosynthesis </li></ul><ul><ul><li>Energy building reactions </li></ul></ul><ul><ul><ul><l...
 
Photosynthesis <ul><li>This is the equation you are used to seeing, but this is not the whole story…  </li></ul>+  water  ...
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Photosynthesis

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  • So, in effect, photosynthesis is respiration run backwards powered by light. Cellular Respiration oxidize C 6 H 12 O 6  CO 2 &amp; produce H 2 O fall of electrons downhill to O 2 exergonic Photosynthesis reduce CO 2  C 6 H 12 O 6 &amp; produce O 2 boost electrons uphill by splitting H 2 O endergonic
  • Photosynthesis

    1. 1. 2006-2007
    2. 2. Photosynthesis: Life from Light and Air 2006-2007
    3. 3. Plants are energy producers <ul><li>Like animals, plants need energy to live </li></ul><ul><li>Unlike animals, plants don’t need to eat food to make that energy </li></ul><ul><li>Plants make both food & energy </li></ul><ul><ul><li>animals are consumers </li></ul></ul><ul><ul><li>plants are producers </li></ul></ul>
    4. 4. How do plants make energy & food? <ul><li>Plants use the energy from the sun </li></ul><ul><ul><li>to make ATP energy </li></ul></ul><ul><ul><li>to make sugars </li></ul></ul><ul><ul><ul><li>glucose, sucrose, cellulose, starch, & more </li></ul></ul></ul>sun ATP sugars
    5. 5. Building plants from sunlight & air <ul><li>Photosynthesis </li></ul><ul><ul><li>2 separate processes </li></ul></ul><ul><ul><li>energy building reactions </li></ul></ul><ul><ul><ul><li>collect sun energy </li></ul></ul></ul><ul><ul><ul><li>use it to make ATP </li></ul></ul></ul><ul><ul><li>sugar building reactions </li></ul></ul><ul><ul><ul><li>take the ATP energy </li></ul></ul></ul><ul><ul><ul><li>collect CO 2 from air & H 2 O from ground </li></ul></ul></ul><ul><ul><ul><li>use all to build sugars </li></ul></ul></ul>ATP sun sugars + carbon dioxide CO 2 sugars C 6 H 12 O 6 water H 2 O + H 2 O CO 2
    6. 6. Using light & air to grow plants <ul><li>Photosynthesis </li></ul><ul><ul><li>using sun energy to make ATP </li></ul></ul><ul><ul><li>using carbon dioxide & water to make sugar </li></ul></ul><ul><ul><li>in chloroplast </li></ul></ul><ul><ul><li>allows plants to grows </li></ul></ul><ul><ul><li>makes a waste product </li></ul></ul><ul><ul><ul><li>oxygen </li></ul></ul></ul>6CO 2 6H 2 O C 6 H 12 O 6 6O 2 sun energy  + + +  glucose + oxygen carbon dioxide sun energy + water + ( ATP )
    7. 7. What do plants need to grow? <ul><li>The “factory” for making energy & sugars </li></ul><ul><ul><li>chloroplast </li></ul></ul><ul><li>Fuels </li></ul><ul><ul><li>sunlight </li></ul></ul><ul><ul><li>carbon dioxide </li></ul></ul><ul><ul><li>water </li></ul></ul><ul><li>The Helpers </li></ul><ul><ul><li>enzymes </li></ul></ul>ATP Make ATP! Make sugar! I can do it all… And no one even notices! enzymes sun H 2 O sugars CO 2
    8. 8. Photosynthesis energy building reactions sugar building reactions ATP ADP sugar sun CO 2
    9. 9. Chloroplasts are only in plants animal cells plant cells
    10. 10. Chloroplasts Chloroplasts in cell Leaf Leaf Chloroplast absorb sunlight & CO 2 make energy & sugar Chloroplasts contain Chlorophyll CO 2
    11. 11. <ul><li>Bring In </li></ul><ul><ul><li>CO 2 </li></ul></ul><ul><ul><li>H 2 O </li></ul></ul><ul><ul><li>light </li></ul></ul><ul><li>Let Out </li></ul><ul><ul><li>O 2 </li></ul></ul><ul><li>Move Around </li></ul><ul><ul><li>sugars </li></ul></ul>So what does a plant need? roots shoot leaves 6CO 2 6H 2 O C 6 H 12 O 6 6O 2 light energy  + + +
    12. 12. Leaf Structure phloem (sugar) xylem (water) stomate guard cell palisades layer spongy layer cuticle epidermis
    13. 13. Transpiration H 2 O CO 2 CO 2 O 2 H 2 O <ul><li>gases in & out </li></ul><ul><li>water out </li></ul>O 2 xylem (water) stomate guard cell
    14. 14. Transpiration <ul><li>Water evaporates from the stomates in the leaves </li></ul><ul><ul><li>water molecules stick to each other </li></ul></ul><ul><ul><li>more water is pulled up the tree </li></ul></ul>
    15. 15. Stomates <ul><li>Function of stomates </li></ul><ul><ul><li>CO 2 in </li></ul></ul><ul><ul><li>O 2 out </li></ul></ul><ul><ul><li>H 2 O out </li></ul></ul>guard cell stomate
    16. 17. Xylem carry water up from roots
    17. 18. Phloem: food-conducting cells <ul><li>carry sugars around the plant wherever they are needed </li></ul><ul><ul><li>new leaves </li></ul></ul><ul><ul><li>fruit & seeds </li></ul></ul><ul><ul><li>roots </li></ul></ul>
    18. 19. Putting it all together <ul><li>Making a living… </li></ul><ul><ul><li>sunlight </li></ul></ul><ul><ul><ul><li>leaves = solar collectors </li></ul></ul></ul><ul><ul><ul><li>photosynthesis </li></ul></ul></ul><ul><ul><li>gases: CO 2 in & O 2 out </li></ul></ul><ul><ul><ul><li>stomates = gases in & out </li></ul></ul></ul><ul><ul><li>H 2 O </li></ul></ul><ul><ul><ul><li>roots take in water from soil </li></ul></ul></ul><ul><ul><ul><li>pulled up by leaf evaporation </li></ul></ul></ul><ul><ul><li>nutrients </li></ul></ul><ul><ul><ul><li>roots take in from soil </li></ul></ul></ul>
    19. 20. How are they connected? Respiration Photosynthesis glucose + oxygen  carbon + water + energy dioxide C 6 H 12 O 6 6O 2 6CO 2 6H 2 O ATP  + + + 6CO 2 6H 2 O C 6 H 12 O 6 6O 2 light energy  + + +  glucose + oxygen carbon dioxide sun energy + water +
    20. 21. Energy cycle Photosynthesis Cellular Respiration O 2 CO 2 plants animals , plants ATP H 2 O sun The Great Circle of Life! Where ’ s Mufasa? glucose
    21. 22. The poetic perspective <ul><li>All of the solid material of every plant was built out of thin air </li></ul><ul><li>All of the solid material of every animal was built from plant material </li></ul>Then all the cats, dogs, mice, people & elephants… are really strands of air woven together by sunlight! sun air
    22. 23. 2006-2007 Got the energy… Ask Questions !!
    23. 24. Energy needs of life <ul><li>All life needs a constant input of energy </li></ul><ul><ul><li>Animals = Heterotrophs </li></ul></ul><ul><ul><ul><li>get their energy from “eating others” </li></ul></ul></ul><ul><ul><ul><ul><li>eat food = other organisms = organic molecules </li></ul></ul></ul></ul><ul><ul><ul><li>make energy through respiration </li></ul></ul></ul><ul><ul><li>Plants = Autotrophs </li></ul></ul><ul><ul><ul><li>get their energy from “self” </li></ul></ul></ul><ul><ul><ul><ul><li>get their energy from sunlight </li></ul></ul></ul></ul><ul><ul><ul><ul><li>build organic molecules (food) from CO 2 </li></ul></ul></ul></ul><ul><ul><ul><li>make energy through photosynthesis </li></ul></ul></ul>
    24. 25. How do plants live? <ul><li>Photosynthesis </li></ul><ul><ul><li>Energy building reactions </li></ul></ul><ul><ul><ul><li>collect sun energy </li></ul></ul></ul><ul><ul><ul><li>make ATP </li></ul></ul></ul><ul><ul><li>Sugar building reactions </li></ul></ul><ul><ul><ul><li>use ATP for energy </li></ul></ul></ul><ul><ul><ul><li>use CO 2 as carbon for new sugars </li></ul></ul></ul><ul><ul><ul><li>build sugars </li></ul></ul></ul><ul><ul><ul><ul><li>glucose, cellulose, starch </li></ul></ul></ul></ul><ul><ul><ul><li>build all other organic molecules </li></ul></ul></ul><ul><ul><ul><ul><li>proteins, lipids, carbohydrates, DNA </li></ul></ul></ul></ul><ul><ul><ul><li>store energy for future use </li></ul></ul></ul><ul><ul><ul><ul><li>starch in seeds & roots </li></ul></ul></ul></ul>
    25. 27. Photosynthesis <ul><li>This is the equation you are used to seeing, but this is not the whole story… </li></ul>+ water + energy  glucose + oxygen carbon dioxide 6CO 2 6H 2 O C 6 H 12 O 6 6O 2 light energy  + + +

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