Transcript The Cycle of Oxygen

Photosynthesis
MT: Cytology
I will understand the
process of
photosynthesis.
What organisms go through
photosynthesis?
 Producers/autotrophs,
such as plants, trees,
algae, some bacteria
Where does photosynthesis
take place?
 In
the chloroplasts of plant cells found in the
leaves!
Chloroplasts have chlorophyll



Chlorophyll is a
green pigment that
reacts to sunlight by
transferring energy to
e- (electrons)
Makes chloroplasts
and plants look
green
Reflect green light
waves from the sun
Stroma (fluid)
Single
thylakoid
Granum
Photosynthesis
 Process
that uses the energy of sunlight to
convert water and carbon dioxide into sugars
(glucose) and oxygen.
If you were making a cake,
what would the…
 Reactants
flour
eggs
sugar
water etc
be?
 Product
a cake!
be?
Photosynthesis Eqn:
Sunlight + 6CO2 + 6H2O =
carbon
dioxide
water
C6H12O6 + 6O2
sugar
(glucose)
oxygen
Photosynthesis Eqn:
6CO2 + 6H2O =
carbon
dioxide
water
C6H12O6 + 6O2
sugar
(glucose)
oxygen
Reactants
Products
“what is used”
“what is made”
Where does the energy for the
reactions in photosynthesis come
from?
 e-
from chlorophyll, charged by sunlight
 NADPH and ATP formed in LD reaction
Photosynthesis
Light-Dependent Reaction
Light-Independent Reaction
AKA Calvin Cycle
- sunlight is required
-sunlight is NOT required
- O2 is produced from water
-Glucose is produced from
CO2
- e- (light energy) fuel the
reactions
Factors that affect photosynthesis



1. Water – needed
to start the LD
reaction
2. Temperature –
proteins work best
between 0-35
degrees Celcius
3. Light – need light
to excite e- in
chlorophyll
Photosynthesis Song
http://www.youtube.com/watch?v=4s8x1KLMzL0