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Photosynthesis:ReadingAc:vity! DIRECTIONS:ReciprocalTeaching:Summarizer,Ques7oner, Clarifier,andPredictor Youarereadingtoanswerthepurposeques7on:Howdoproducers usesunlighttomaketheirfoodthroughphotosynthesis? Alright,sonowyouknowthebasics.Theoriginalsourceofenergy fornearlyeverylivingthingonEarthistheSun.Butonlysome organismscanusethatenergydirectly.Producersareorganisms thatcanusethesun’senergytomaketheirownfood,andtheydo thatthroughaprocesscalledphotosynthesis.Youmightalsoknow ofproducersasautotrophs,ortheplantkingdom. Butjusthowdoproducersperformphotosynthesis?Whatdoesthat processlooklike?Thefirststepiswhenaplantcapturesthesun’s energy.Doyourememberwhatorganelleaplantusestocapture sunlight?Ifyousaidchloroplast,yourememberedwell.Achemical calledchlorophyllcontainedwithinthechloroplastisableto capturethesun’senergy,sotheenergycanbeusedtomakefood. Thesecondstepiswhenaplantcellusestheenergyithascaptured fromthesuntoproduceitsownfood.Justlikebakingacake requiresmanyingredients,likebuPerandsugar,aplantneeds ingredientstomakeitsfood.Thefirstingredientaplantcellneeds iswater;thisispartofwhywaterisimportanttoalllivingthings. Plantsareabletoabsorbwaterfromthesoilthroughitsroots,and thenittravelsupthroughthesteptotheleaves. Thesecondingredientaplantcellneedstomakeitsownfoodis carbondioxidegas.Thisisacolorlessandodorless(withoutsmell) gasthatexistsintheairaroundus.Infact,webreatheitout!While plantsdon’thavemouthsandtracheastotakeinair,theyhave smallopeningsontheundersidesoftheirleavescalledstomatathat takeincarbondioxide.Oncethecarbondioxideandwaterare insidealeaf,thetwoingredientsmoveintotheplant’schloroplasts. OnTask_______ 100%Effort_______ Pen/Pencil Andon7me_______ A+expecta7ons_______ Total:/4 Name: ____________________ Period:__________ Photosynthesis:ReadingAc:vity! IfyoucombinedbuPer,sugar,eggsandmilk,youwouldn’tgeta cake.Youneedtobakethecakeintheoven!Inthesameway,it’s notenoughtojustcombinewaterandcarbondioxideinaplant cell’schloroplasts.Youmustaddtheenergythechloroplastshad capturedfromthesun.Thesun’senergyisthethirdandfinal ingredientnecessaryforaplantcelltodophotosynthesisandmake itsownfood! Oncethewaterandcarbondioxidehavebeencombined,andthe sunlightadded,severalchemicalreac7onstakeplacewithinthe chloroplasts.Whenallofthosereac7onsaredone,theplantcell hasmadetwoimportantproducts.Thefirstkeyproductissugar. Thisisthefoodtheplantcellmakesthroughphotosynthesis.The plantcellstoresthissugar,andatsomelater7me,whenitneeds energy,itusesitsmitochondriatobreakthesugardownforenergy. Thepointofphotosynthesisistomakefood,butthereisanother importantproductofphotosynthesisaswell,andthatisoxygengas. Justlikecarbondioxideentersthroughthestomataonthe undersideofaleaf,theoxygenisabletoleavetheplantthrough thesestomata.Thisisagreatexampleofhoworganismsinteract withotherstogetwhattheyneedtolive.Webreatheoutcarbon dioxidethatplantsneedtomakefood.Theplantsthenmake oxygen,whichweneedtobreathe.Everyonewins! Donewiththereading! Woo-hoo! Nowmoveontothe post-readingques?onsonthe nextpage! Be your best. Ecologist’sName:_________________________________Period:_____Date:______________ Mrs.Bouchard–7thGradeScience Post-ReadingQues:ons 1. Fillinthediagrambelowwiththethreeingredientsandtwoproductsofphotosynthesis. Ingredients Products 1._____________________ 1._____________________ 2._____________________ 2._____________________ 3._____________________ 2. Howdoproducerscapturethesun’senergytoperformphotosynthesis? HINT:Youshouldnameanorganelle. ____________________________________________________________________________ ____________________________________________________________________________ _________________________________________________________________________ 3. Plantscan’t“breathe.”Sohowdotheytakeincarbondioxide,andreleaseoxygen? ____________________________________________________________________________ __________________________________________________________________________ 4. Thebigques7onforthisunitis:Howdoorganismsinteractwitheachotherandtheir environments,togetwhattheyneedtolive?Howisphotosynthesisagoodexampleofhow plantsandanimalsinteracttogetwhattheyneedtolive? ____________________________________________________________________________ ____________________________________________________________________________ _________________________________________________________________________ You’redone!Nowyouhavenohomework!
