Download PHOTOSYNTHESIS

WHAT DO
ALL OF
THESE
PLANTS
HAVE IN
COMMON?
Energy for Life
• All living things require energy to grow
and reproduce
• They get that energy by making it,
eating it, or absorbing it
Glucose
• Most living things on Earth break down
glucose to get their energy
– Autotrophs (plants) use a process called
photosynthesis to make glucose
– Heterotrophs (animals) eat and then digest
food to produce glucose
Glucose
• Glucose is a monosaccharide which
means one sugar
• There are many different models to
describe glucose
Photosynthesis
• The process by which plants, and some
other organisms, use radiant energy,
carbon dioxide and water to make
glucose and oxygen.
– Glucose is stored in leaves, stems and
roots
– Oxygen is given off as a waste
Energy Conversion
• Through photosynthesis plants and
some other organisms convert
radiant energy
chemical energy
(from the sun)
(stored as glucose)
and
energy (light)
matter (leaves,
stem, bark)
Photosynthesis Equation
carbon dioxide
water
glucose
Sunlight
oxygen
Chlorophyll
6CO2 + 6H2O
C6H12O6 + 6O2
Reactants
Products
Photosynthesis
• Once the plants produce glucose, they
store it until needed.
• When they need energy, the glucose is
broken down to release the energy
inside.
Leaf Anatomy
• Sunlight can enter through the leaf’s surface
• For water and carbon dioxide to enter, and
oxygen to exit, leaves need a “doorway”
Leaf Anatomy
• Stomata
– Openings in the
underside of the leaf
that act as doorways
for raw materials and
waste to enter and
exit the leaf
• Usually open during
the day and closed at
night
Plant Cell
Chloroplasts
Chloroplast
• Small, green body inside the plant cell where
photosynthesis takes place
• Chloroplasts can move inside the plant cell to get
closer to light
Pigments
• Chemical
compounds that
give things
color
Chlorophyll
• Green pigment found in plants where
photosynthesis takes place
• Plants can produce more chlorophyll
when they get more sunlight
• Photosynthesis only occurs in plant
cells that have chloroplasts
All plants with green areas can produce
food through photosynthesis.
Do you think anything else can use
photosynthesis?
photosynthetic bacteria
photosynthetic plankton
algae
Energy for Life
• Plants provide food for the entire planet
• provide 90% of Earth’s oxygen
• filter out carbon dioxide
• Why is it important to save trees?
glucose
chlorophyll