Ch. 8
Photosynthesis
LM p. 41-42
ENERGY & LIFE
• Autotrophs get energy
they need to produce
food from the sun (or a light
source)
• ATP stores energy for
cell activities like active
transport & movement
within the cell
PLANT EXPLORATION…
Van Helmont:
Priestley:
• Plants need • Plants
water to
produce
grow
oxygen (O2)
Ingenhousz:
• Plants need
light to
produce
oxygen (O2)
Plants are green because of the
CHLOROPHYLL
pigment ______________.
(which absorbs light energy)
•During the fall, the green chlorophyll pigments are greatly
reduced revealing the other pigments.
•Carotenoids are pigments that are either red or yellow.
Chloroplast
Structures &
Function:
Locate the …
1. Thylakoids
2. Granum
3. Stoma
2 stages of photosynthesis:
1. Light-dependent reactions
2. Calvin Cycle (Light-independent)
Light Dependent
Reactions
• Light absorbed by
chlorophyll
(in Thylakoids)
• ADP converted to
ATP
• Convert NADP+ to
NADPH
(Electron Carriers)
• Produce Oxygen
(O2) gas
Calvin Cycle
• CO2 enters from
atmosphere
• Energy from ATP &
NADPH used to
convert 3-carbon
molecule to higher
energy
• Produces a single
6-carbon sugar
molecule
Basic Process of Photosynthesis:
H2O
CO2
S
u
n
L
I
G
H
T
Light
Dependent
Reactions
Calvin Cycle
CHRLORPLAST
O2
Sugars
Factors that affect the rate
of Photosynthesis are…
• Availability of Water
• Temperature
• Intensity of Light
• Concentration of CO2
“World of Plants: Photosynthesis”
Video Notes & Quiz
• Clear your desk except for the video
notes page & pencil/pen
• Answer each question while watching
the short video clip on photosynthesis
(There will be a video quiz at the end)
CH. 9 CELL RESPIRATION