Energy Transfer In Plants
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Transcript Energy Transfer In Plants
Energy Transfer In Plants
Changing the Sun’s Energy Into
Useable, Stored Energy
All Life Needs Energy!!
Some life uses a process called chemosynthesis to make
life possible.
Bacteria can get energy from thermal vents on the ocean
floor!!!
Hydrogen sulfide chemosynthesis CO2+O2+4{H2S}→CH2O+4{S}+3{H2O}
But even this depends on photosynthesis!! (O2 from plants)
Chloroplast
Sunlight
Plant Cell
Parts of the Plant Cell
Life Needs Useable Energy
Remember!! ATP is
the useable form of
energy in a cell!
In order for a plant to
make ATP they must
perform 2 processes,
Photosynthesis &
Cellular Respiration
Plants Do BOTH!!
Photosynthesis with
Chloroplasts
And Cellular
Respiration with
Mitochondria
Where Does It Start?
Photosynthesis
begins with Sunlight,
when it hits the leaves
of plants (and some
protists or bacteria)
Photosynthesis has 3 stages
I. Capture Light Energy
II. Make Chemical Energy
III. Store Energy In Carbohydrates
Photosynthesis: Stage 1
Light hits the
chloroplast and is
absorbed by a
pigment called
chlorophyll
A pigment is any
light absorbing
substance
Stage 1: Continued
Sunlight
Chlorophyll
membrane of
chloroplast
{
e-
2 H2O
electron
4H
O2
+
In Stage 1, the
energy from the light
splits H2O into three
parts:
Oxygen (O2)
Hydrogen Ions (H+)
Electrons (e-)
Photosynthesis: Stage 2
The H+ and e- are pushed through the
electron transport chain to make NADPH
NADPH is like a rechargeable battery
Photosynthesis: Stage 3
This stage DOES NOT require LIGHT.
NADPH provides the energy to combine CO2
molecules into carbohydrates such as glucose
(C6H12O6)
This process is called the “Calvin Cycle”
3 Carbon Sugars
CO2
Carbohydrates
ADP
Calvin
Cycle
ATP
NADP +
NADPH
Photosynthesis: The Reaction
(6) CO2 + (6) H2O
Light
C6H12O6 + (6) O2
Enzymes
Reactants: Carbon Dioxide & Water
Products: Glucose & Oxygen
What’s Next?
Some glucose is
stored as starch.
The rest of it goes to
the cytoplasm to
begin to make ATP
through Cellular
Respiration!!