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Photosynthesis: Life from Light and Air

Photosynthesis: Life from Light and Air. Plants are energy producers. Like animals, plants need energy to live unlike animals, plants don’t need to eat food to make that energy Plants make both FOOD & ENERGY animals are consumers plants are producers. How do plants make energy & food?.

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Photosynthesis: Life from Light and Air

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  1. Photosynthesis:LifefromLight andAir

  2. Plants are energy producers • Like animals, plants need energy to live • unlike animals, plants don’t need to eat food to make that energy • Plants make both FOOD & ENERGY • animals are consumers • plants are producers

  3. How do plants make energy & food? • Plants use the energy from the sun • to make ATP energy • to make sugars • glucose, sucrose, cellulose, starch, & more sun ATP sugars

  4. H2O CO2 Building plants from sunlight & air sun • Photosynthesis • 2 separate processes • Light-Dependent Reactions (ENERGY building reactions) • collect sun energy • use it to make ATP • Light-Independent Reactions (SUGAR building reactions) • take the ATP energy • collect CO2 from air & H2O from ground • use all to build sugars ATP + sugars carbon dioxide CO2 water H2O sugars C6H12O6 +

  5. (ATP) = used to build the sugar carbon dioxide sun energy  glucose + oxygen + water + sun energy  6CO2 + 6H2O + + 6O2 C6H12O6 Using light & air to grow plants • Photosynthesis • using sun’s energy to make ATP • using CO2 & water to make sugar • in chloroplasts • allows plants to grow • makes a waste product • oxygen (O2)

  6. CO2 H2O sugars What do plants need to grow? • The “factory” for making energy & sugars • chloroplast • Needed Fuels • sunlight • carbon dioxide • water • The Helpers • enzymes Make ATP!Make sugar!I can do it all…And no oneeven notices! sun ATP enzymes

  7. H2O CO2 sun Photosynthesis ENERGYbuilding reactions ATP ADP SUGARbuilding reactions used immediatelyto synthesize sugars sugar

  8. Chloroplasts are only in plants animal cells plant cells

  9. CO2 Chloroplasts absorbsunlight & CO2 sun Leaf Chloroplastsin cell Chloroplast Chloroplasts contain Chlorophyll makeENERGY & SUGAR

  10. light energy  6CO2 + 6H2O + + 6O2 C6H12O6 So what does a plant need? • Bring In • light • CO2 • H2O • Let Out • O2 • Move Around • sugars leaves shoot roots

  11. vascular bundle (vein) xylem (water) phloem (sugar) cuticle epidermis palisades layer spongy layer epidermis stomate cuticle guardcells Leaf Structure

  12. xylem (water) stomate guardcells Transpiration O2 H2O CO2 • CO2 in • O2 out • water out • so it gets to leaves from roots O2 H2O CO2

  13. Transpiration • Water evaporates from the stomates in the leaves • pulls water up from roots • water molecules stick to each other (cohesion) • more water is pulled up tree from ground

  14. Function of Leaf Structures • Cuticle • waxy coating reduces water loss • Epidermis • skin protecting leaf tissues • Palisades layer • high concentration of chloroplasts • collecting sun’s energy • photosynthesis • making ATP & sugars • Spongy layer • air spaces • gas exchange • CO2 in for sugar production, remove waste O2

  15. Stomates & Guard Cells • Function of stomates • CO2 in • O2 out • H2O out • gets to leaves for photosynthesis • Function of guard cells • open & close stomates guard cell stomate

  16. Guard cells & Homeostasis • Homeostasis • keeping the internal environment of the plant balanced • Stomates open (Hypotonic) • let CO2 in • needed to make sugar • let O2 out • get rid of waste product • Stomates close (Hypertonic) • if too much H2O evaporating • photosynthesis stops

  17. Xylem Carry water up from roots

  18. Phloem: food-conducting cells • Carry sugars around the plant wherever they are needed • new leaves • fruit & seeds • roots

  19. Putting it all together • Making a living… • sunlight • leaves = solar collectors • photosynthesis • gases: CO2 in & O2 out • stomates = gases in & out • H2O • roots take in water from soil • pulled up by leaf evaporation • nutrients • roots take in from soil

  20. air The poetic perspective • All of the solid material of every plantwas built out of thin air • All of the solid material of every animal was built from plant material sun Then all the cats, dogs, mice, people & elephants…are really strands of air woven together by sunlight!

  21. Got the energy… Ask Questions!!

  22. carbon dioxide sun energy  glucose + oxygen + water + glucose + oxygen  carbon + water + energy  C6H12O6 + 6O2 6CO2 + 6H2O + ATP dioxide light energy  6CO2 + 6H2O + + 6O2 C6H12O6 How are they connected? Respiration Photosynthesis

  23. sun glucosesugars H2O Energy cycle Photosynthesis plants CO2 O2 animals, plants Cellular Respiration ATP The Great Circleof Life! Mufasa?

  24. sun H2O Another view… capturelight energy Photosynthesis synthesis producers, autotrophs CO2 O2 organicmoleculesfood waste waste waste consumers, heterotrophs digestion Cellular Respiration ATP releasechemical energy

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