Photosynthesis



Title :

Photosynthesis

Author :

Kim Foglia & Kelly Reidell

Number of slides:

18

Source:

Slideshow :





Content transcript :


Photosynthesis:
Life from Light and Air
Energy needs of life
* All life needs a constant input of energy
* Heterotrophs (Animals)
* get their energy from “eating others”
* eat food = other organisms = organic molecules
* make energy through respiration
* Autotrophs (Plants) 
* produce their own energy (from “self”)
* convert energy of sunlight
* build organic molecules (CHO) from CO2 
* make energy & synthesize sugars through photosynthesis
Plant structure 
* Obtaining raw materials
* sunlight
* leaves = solar collectors
* CO2
* stomates = gas exchange
* H2O
* uptake from roots
* nutrients
* N, P, K, S, Mg, Fe… 
* uptake from roots
Chloroplasts
Plant structure 
* Chloroplasts
* double membrane
* stroma
* fluid-filled interior
* thylakoid sacs
* grana stacks
* Thylakoid membrane contains
* chlorophyll molecules
* electron transport chain
* ATP building molecule
Photosynthesis
* Light reactions
* light-dependent reactions
* energy conversion reactions
* convert solar energy to chemical energy
* ATP & NADPH
* Calvin cycle
* light-independent reactions
* sugar building reactions
* uses chemical energy (ATP & NADPH) to reduce CO2 & synthesize C6H12O6
Light reactions
* Electron Transport Chain 
* uses electrons to pump hydrogens
* proteins in organelle membrane 
* electron acceptors
* NADPH
* pumps H+ to
make ATP
Light Reaction
* ETC uses light energy to produce
* ATP & NADPH
* go to Calvin cycle
* Light drives the process
* enzyme extracts electrons from H2O & supplies them to chlorophyll
* splits H2O
* O2 released to atmosphere
* and we breathe easier!


      The Calvin Cycle
  Life from Air
Remember what it means to be a plant…
* Need to produce all organic molecules necessary for growth
* carbohydrates, lipids, proteins, nucleic acids 
* Need to store chemical energy (ATP) produced from light reactions
* in a more stable form 
* that can be moved around plant
* saved for a rainy day
In the light reactions…
* Convert solar energy to chemical energy
* ATP
* NADPH
* What can we do now?
From Light reactions to Calvin cycle
* Calvin cycle 
* chloroplast stroma
* Need products of light reactions to drive synthesis reactions
* ATP
* NADPH

Photosynthesis summary
* Light reactions
* produced ATP
* produced NADPH
* consumed H2O
* produced O2 as byproduct
* Calvin cycle
* consumed CO2
* produced Glucose (sugar)
* regenerated ADP
* regenerated NADP
Putting it all together
Energy cycle
Chloroplasts are only in plants

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