Download Photosynthesis and Respiration

CHARACTERISTICS OF LIFE
All living things use energy
How do living things get and use energy?
Through a
process called
The Carbon
Dioxide/Oxygen
Cycle
Photosynthesis
and Cellular
Respiration are
parts of this
cycle
PHOTOSYNTHESIS
Definition: THE PROCESS BY WHICH GREEN
PLANTS USE LIGHT, WATER AND CARBON
DIOXIDE TO MAKE GLUCOSE (food) AND
MAKE THE SUN’S ENERGY AVAILABLE TO
ALL LIVING THINGS.
HOW DO THE MATERIALS FOR
PHOTOSYNTHESIS ENTER THE
PLANT???
Carbon Dioxide – enters the plant
through a pore called a STOMATA.
Water – enters the plant through the
roots and is carried up the stem by
the XYLEM. Water exits the plant
through the STOMATA.
WHERE DOES PHOTOSYNTHESIS
TAKE PLACE???
IN THE LEAVES,
SPECIFICALLY IN THE
CHLOROPLASTS
CO
2
H2
O
SUGAR
PRODUCED
IS CALLED
GLUCOSE
C6H1206
O2 IS A
WASTE
PRODUCT
What exactly IS
photosynthesis???
Photosynthesis
• A CHEMICAL REACTION
• SO, PLANTS CHANGE
WATER, CO2, AND
SUNLIGHT INTO NEW
SUBSTANCES
The chemical reaction looks like this:
6 CO2 + 6 H2O + Energy  C6H12O6 + 6 O2
carbon dioxide + water + sunlight  glucose + oxygen
Remember, THE BONDS that hold GLUCOSE together
CONTAIN THE ENERGY FROM THE SUN AND ARE
STORED FOR LATER USE BY THE PLANT........................
Photosynthesis:
This is the chemical reaction on Earth which allows the
amount of carbon dioxide in the atmosphere to remain
constant.
• Photosynthesis removes 60 million tons of carbon
dioxide from the air each year.
• It occurs in all green plants on the surface of the Earth
and also in the algae (seaweed) and in plankton
(unicellular organisms) living near the surface of bodies
of water (such as the ocean).
• Oxygen is the product of photosynthesis. Without
oxygen, all animal and human life (including oxygen
loving decomposing bacteria) would die.
• Oxygen is used by living things to break down food
so that energy can be released.
• CELLULAR RESPIRATION
Definition: process used by living cells to
break down sugar (glucose) molecules
consumed to release ATP energy.
CELLULAR RESPIRATION
Glucose and Oxygen goes to mitochondria of a cell.
ATP energy released
Oxygen is the key that unlocks the energy
C6H1206
O2
H20
ENERGY
RELEASED
CO2
Water and carbon dioxide are waste products
What exactly IS respiration???
Chemical reaction involves oxygen and
results in the production of ATP energy,
carbon dioxide and water:
C6H12O6 + 6 O2  6 CO2 + 6 H2O + ATP Energy
glucose oxygen
carbon water energy
dioxide
The reactions for photosynthesis and respiration are
OPPOSITES of one another:
carbon dioxide + water + sunlight  glucose + oxygen
6 CO2 + 6 H2O + Energy  C6H12O6 + 6 O2
reactants
products
glucose + oxygen carbon dioxide + water + ATP energy
C6H12O6 + 6 O2  6 CO2 + 6 H2O + ATP Energy
reactants
products