Transcript Photosynthesis Presentation ppt

The Secret of Life
1
All living things need food.
Some animals eat plants,
some eat other animals –
and some eat both.
Food contains the chemical
energy
the body uses
to do things –
like run, think and grow.
Trees and
other plants
don’t eat food.
Where do they
get the
chemical
energy they
need to live and
the process plants use to make food
Plants use water, carbon dioxide and sunlig
AIR
SUNLIGHT
WATER
to make a sugar called glucose,
which contains the chemical energy they
•
The water used for photosynthesis is in the soil.
Water gets to the leaves via the roots.
•
Plants use carbon dioxide from the
air to make glucose.
Photosynthesis occurs in
the plant cells in the
leaves.
 Plant Cell
•
Sunlight energy hits the chlorophyll found in the cells
which splits the water molecules into hydrogen and
oxygen.
In the process, the carbon dioxide molecules are split
•
into carbon and oxygen atoms.
The atoms from these raw materials recombine to form
a glucose molecule:
6 Carbon
6 Water
Dioxide
1 glucose
6 oxygen
The carbon atoms form a chain with
hydrogen and oxygen atoms attached to it.
The products of photosynthesis are glucose and
oxygen.
Oxygen Bubbles 
Oxygen molecules not needed to build glucose are
released into the air.
This adds oxygen to the air we breathe.
The photosynthesis equation is:
+ 6CO2 + 6H2O
Sunlight + carbon + water
dioxide
C6H12O6 + 6O2
glucose + oxygen
In photosynthesis light energy is
transformed into chemical energy in the
form of glucose.
Light Energy
Photosynthesis
Chemical Energy
The glucose molecules formed during
photosynthesis store the chemical energy that
plants need to grow, bloom, and produce fruit.
the process plants use to release
energy stored in glucose molecules
Photosynthesis
+ 6CO2 + 6H2O
Sunlight + carbon + water
Respiration
dioxide
C6H12O6 + 6O2
glucose + oxygen
C6H12O6 + 6O2
6CO2 + 6H2O +
E
glucose + oxygen
carbon + water +
dioxide
Energy
NOTICE ANYTHING?
•
When oxygen combines with glucose
it splits apart and energy is released
water
carbon
dioxide
– and what’s left is:
carbon dioxide and water.
Plants respire during the day and at night.
•
The energy released when glucose breaks
down into water and carbon dioxide is the
energy plants use to grow and repair