Ch. 8, Photosynthesis

1
Where Does Energy Come From?
The Sun the ultimate energy source on Earth
Everyone needs me, ha ha.
2
Who Uses Sunlight for Energy?

• Autotrophs auto (self), self-sustaining, plants
  and some other types of organisms use suns light
  energy to produce food
• Heterotrophs hetero (other), animals and other
  organisms, cant use the suns energy directly,
  they obtain energy from the foods they consume
• Eat grasses (herbivores)
• Eat other animals (carnivores)
• Eat dead/decomposing things (decomposers)
• Eat plants and animals (omnivores- you!)

What am I?
3
What Kinds of Energy Do You Use?

• Coal decaying fossils of plants and animals
• Oil- decaying fossils of plants and animals
• Natural Gas- decaying fossils of plants and
  animals
• Wood/Peat/Moss- burning of plant materials
• Solar- directly from the sun

Write 2-3 from this list
All of these come from the Suns energy!
4
Chemical Energy- ATP

• Energy is stored in a chemical
• form called ATP
• ATP adenosine triphosphate, the main energy
  compound cells use to store and release energy
• ADP adenosine diphosphate is the base for making
  ATP, and a 3rd phosphate is added to ADP to make
  ATP, like charging a battery
• By breaking the bonds (shared electrons) between
  the phosphate groups, energy is released

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5

• How do cells charge ADP back into ATP?
• Through breaking down food to produce energy.
• Food is used to recharge the batteries.