3 Plants are energy producers Like animals, plants need energy to liveunlike animals, plants don’t need to eat food to make that energyPlants make both FOOD & ENERGYanimals are consumersplants are producers
4 How do plants make energy & food? Plants use the energy from the sunto make sugarsglucosesunsugars
5 Building plants from sunlight & air Photosynthesis2 separate processesENERGY collectioncollect sun energySUGAR buildinguse the energycollect CO2 from air & H2O from grounduse all to build sugarsH2Osun+CO2sugarscarbon dioxideCO2waterH2OsugarsC6H12O6+
6 Plant System INPUTS OUTPUTS leaves shoot roots light CO2 H2O O2 Sugar (glucose)leavesshootroots6CO26H2OC6H12O66O2lightenergy+
7 Make sugar! I can do it all… And no one even notices! CHLOROPLASTSThis is where plants collect sunlightand make sugars.Make sugar! I can do it all… And no one even notices!sunCO2sugarsH2O
8 Chloroplasts are only in plants animal cellsplant cells
9 How are plants and animals connected? Respirationglucose + oxygen carbon + water + energydioxideC6H12O66O26CO26H2Oenergy+PhotosynthesisSo, in effect, photosynthesis is respiration run backwards powered by light.Cellular Respirationoxidize C6H12O6 CO2 & produce H2Ofall of electrons downhill to O2exergonicPhotosynthesisreduce CO2 C6H12O6 & produce O2boost electrons uphill by splitting H2Oendergonic6CO26H2OC6H12O66O2lightenergy+ glucose + oxygencarbondioxidesun+ water +
10 The Great Circle of Life! sunEnergy cyclePhotosynthesisplantsH2OCO2glucose sugarsO2animals, plantsCellular RespirationThe Great Circle of Life!Mufasa?
11 The poetic perspective All of the solid material of every plant was built out of thin airAll of the solid material of every animal was built from plant materialsunairThen all the cats, dogs, mice, people & elephants… are really strands of air woven together by sunlight!
12 END OF NOTES Show video: The world of plants: Photosynthesis Complete the videoguideThe next few slides give additional “extra” information
13 Putting it all together Making a living…sunlightleaves = solar collectorsphotosynthesisgases: CO2 in & O2 outstomates = gases in & outH2Oroots take in water from soilpulled up by leaf evaporationnutrientsroots take in from soil
14 Transpiration Water evaporates from the stomates in the leaves pulls water up from rootswater molecules stick to each othermore water is pulled up tree from ground
15 Stomates & Guard Cells guard cell stomate Function of stomates CO2 inO2 outH2O outgets to leaves for photosynthesisFunction of guard cellsopen & close stomatesguard cellstomate
16 Guard cells & Homeostasis keeping the internal environment of the plant balancedStomates openlet CO2 inneeded to make sugarlet H2O outso it gets to leaveslet O2 outget rid of waste productStomates closeif too much H2O evaporating
18 Phloem: food-conducting cells carry sugars around the plant wherever they are needednew leavesfruit & seedsroots
19 organic molecules food consumers, heterotrophs release chemical energy sunAnother view…capture light energyPhotosynthesissynthesisproducers, autotrophsH2OCO2organic molecules foodO2wastewastewasteconsumers, heterotrophsdigestionCellular RespirationATPrelease chemical energy