Photosynthesis
and Cellular
Respiration
Photosynthesis
 The
process in
which organisms use
water along with
sunlight and carbon
dioxide to make
food
What performs photosynthesis?
 Autotrophs-an
organism that can “make”
its own food
 Examples of Autotrophs include:
 Algae-a simple nonflowering plant that
is often unicellular
 Phytoplankton-microscopic plants that
drift or float in the sea or in fresh water
 And of course….PLANTS!
How does photosynthesis
work?
INPUTS
 Sunlight-
absorbed
by chlorophyll
 6 Water Molecules
6
Carbon Dioxide
Molecules
How does photosynthesis
work?
OUTPUTS
 1 molecule of Glucose
 6 molecules of O2
All together: Are both sides
even for each element?
+
+
=
Written and Chemical Formula
for Photosynthesis
 Carbon

dioxide + water+ sunlight glucose +oxygen
6CO2
+ 6H20 + sunlightC6H12O6 + 6O2
Cellular Respiration
 How
glucose (a simple sugar) is
broken down in the mitochondria for
energy
 Cellular Respiration occurs after
photosynthesis
 Powerhouse-Mitochondria break
things down, like our digestive system
If we already have glucose, why
do we need cellular respiration?
 Glucose
has to be broken down into ATP: an
energy source that plants and humans can
use
 Glucose is stored until it’s needed!
Written and Chemical Formula
for Cellular Respiration
 Glucose
+ Oxygen  Carbon Dioxide + Water +
Energy (ATP)
 C6H12O6+
6O2 6CO2 + 6H2O + ENERGY (ATP)
Cellular Respiration: in plants
and animals
Photosynthesis and Cellular
Respiration
 Photosynthesis
releases oxygen into
the air so we all can survive
 Photosynthesis also gives us glucose
when we eat a plant
 This energy is then turned into a
usable form through cellular
respiration
Photosynthesis and Cellular
Respiration
 http://w
ww.yout
ube.com
/watch?
v=JUmT2
4R8CyA