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2006-­‐2007  

 Photosynthesis:    Life  from  Light  and  Air  

*  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  

Plants  are  energy  producers   Chloroplasts  are  only  in  plants  animal  cells   plant  cells  

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*  Plants  use  the  energy  from  the  sun  *  to  make  ATP  energy  *  to  make  sugars  

*  glucose,  sucrose,  cellulose,  starch,  &  more  

How  do  plants  make  energy  &  food?  

sun  

ATP  

sugars  

H2O  

*  Photosynthesis  *  2  separate  processes  *  ENERGY  building  reactions  

*  collect  sun  energy  *  Take  H2O  from  ground  *  Use  it  to  make  ATP  *  This  is:  “Light-­‐Dependent  Reactions”  

*  SUGAR  building  reactions  *  take  the  ATP  energy  *  collect  CO2  from  air  &    use  all  to  build  sugars  *  This  is:  “Light-­‐independent  Reactions”  

Building  plants  from  sunlight  &  air  

ATP  

sun  

sugars  

+  

carbon  dioxide  CO2  

sugars  C6H12O6  

CO2  

water  H2O  +  

* 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)  

Using  light  &  air  to  grow  plants  

6CO2   6H2O   C6H12O6   6O2  sun  energy  

→  

+   +  +  

→  glucose  +  oxygen  carbon  dioxide  

sun  energy  +  water  +  

(ATP)  =  used  to  build  the  sugar  

*  The  “factory”  for  making    energy  &  sugars  *  chloroplast    *  Fuels  *  sunlight  *  carbon  dioxide  *  water  *  The  Helpers  *  Enzymes  *  Rubisco  

What  do  plants  need  to  grow?  

H2O  

sugars  

ATP  

Make ATP! Make sugar! I can do it all… And no one even notices!

enzymes  

CO2  

sun  

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H2O  

Photosynthesis  

ENERGY  building    reactions  

SUGAR  building    reactions  

ATP  ADP  

CO2  sugar  

sun  

used  immediately  to  synthesize  sugars  

H2O  

Chloroplasts  

Chloroplasts  in  cell  

Leaf  

Leaves  

Chloroplast  

absorb  sunlight,  H2O  &  CO2  

make  ENERGY  &  SUGAR  

Chloroplasts  contain  Chlorophyll  

CO2  

Chloroplast  

sun  

*  Bring  In  *  light  *  CO2  *  H2O  *  Let  Out  *  O2  

*  Move  Around  *  sugars  

So  what  does  a  plant  need?  

6CO2   6H2O   C6H12O6   6O2  light  energy   →  +   +  +  

roots  

shoot  

leaves  *  Explain  where  plants  get  the  energy  they  need  to  produce  

food.  *  What  is  photosynthesis?  State  the  overall  equation  for  

photosynthesis.  *  Describe  the  role  of  ATP  in  plants  and  their  cellular  

activities.  *  Describe  all  parts  of  the  chloroplast.  What  is  the  

importance  of  the  chloroplast?  *  What  factors  affect  photosynthesis?  *  Describe  the  role  of  light  and  pigments  in  photosynthesis.  

Write  a  few  paragraphs  explaining  the  following  objectives  we’ve  covered