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Photosynthesis
Where energy comes from….
Photosynthesis
 Photosynthesis: The process that captures the sun’s
energy to make food.
 Photo= “light”
 Synthesis=“putting together”
 Turns light energy into chemical energy
Chlorophyll
 Chlorophyll is a chemical in chloroplasts
that can absorb or trap light energy
 This is green pigment is found
mostly in plant leaves
Atoms
 An atom is the basic unit of ALL living & non-living
things
 Atoms are made of:
 Protons (+)
 Neutrons (no charge)
 Electrons (--)
Elements
 An element is a form of matter that is made of only 1
type of atom
 Elements are found on the periodic table & each has
a different number of protons
 Examples: Carbon, Oxygen, Nitrogen, Hydrogen
Common Elements found in the Air,
Ocean, Living Things, & the Earth’s Crust
Element Name
Chemical Symbol
Calcium
Ca
Nitrogen
N
Hydrogen
H
Oxygen
O
Carbon
C
Silicon
Si
Aluminum
Al
Iron
Fe
Sodium
Na
Potassium
K
Magnesium
Mg
Chemical Symbols
 Elements are represented using chemical symbols
 Examples:
-Oxygen (O)
-Hydrogen (H)
-Carbon (C)
-Calcium (Ca)
Compounds
 When two or more atoms of different elements
combine this forms a compound.
 The letters represent the element name
 The number represents how many
 Examples: Water (H2O)
Photosynthesis Compounds
Raw Materials: (What is needed)
Products : (What is made)
Sunlight /energy
Sugar/Glucose (C6H12O6)
Water (H2O)
Oxygen (O2)
Carbon Dioxide (CO2)
Chemical Equation for
Photosynthesis
6H2O + 6CO2 + Light Energy  C6H12O6 + 6O2
Raw Material+ Raw Material = Products
Chemical equations show how things change in a
chemical reaction.
How do these thing get to the plant?
 Water is taken in by the roots
 Carbon dioxide enters through stomata in the leaves
Photosynthesis at Work
 The sugar produced during photosynthesis stores
energy for producers
 Oxygen is released as a
waste product
Photosynthesis and food webs
 Energy is the basic need of all
living things
 Photosynthesis is the base of
the food web
Cellular Respiration
The release of energy
How does food turn into energy?
 Food goes into your digestive system
 Once digested it enters your
bloodstream
 Next it enters the cell through diffusion!
 Respiration occurs inside the cell using
oxygen in both plants & animals!
Respiration
 Respiration: The process cells use to break down
stored food energy (glucose).
 When glucose is broken down =
energy is released
Respiration Compounds
Raw Materials: (What’s needed)
Products: (What’s made)
Oxygen (O2)
Energy (ATP)
Glucose (C6H12O6)
Carbon Dioxide (CO2)
Water (H2O)
Chemical Equation for Respiration
 C6H12O6+ 6O2 6CO2+ 6H2O+ Energy
 Raw Materials + Raw Materials = Products
 Does this look familiar?
Photosynthesis Video
Respiration Video
Where do photosynthesis &
respiration occur in the cell?
Photosynthesis
Chloroplast
Cellular
Respiration
Mitochondria