1. Energy Transfer In Plants
Changing the Sun’s Energy Into Useable, Stored Energy

2. 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)

3. Chloroplast
Sunlight
Plant Cell

4. Parts of the Plant Cell

5. 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

6. Plants Do BOTH!! Photosynthesis with Chloroplasts
And Cellular Respiration with Mitochondria

7. Where Does It Start?
Photosynthesis begins with Sunlight, when it hits the leaves of plants (and some protists or bacteria)

8. Photosynthesis has 3 stages
Capture Light Energy
Make Chemical Energy
Store Energy In Carbohydrates

9. Photosynthesis: Stage 1
Light hits the chloroplast and is absorbed by a pigment called chlorophyll
A pigment is any light absorbing substance

10. Stage 1: Continued
In Stage 1, the energy from the light splits H2O into three parts:
Oxygen (O2)
Hydrogen Ions (H+)
Electrons (e-)

11. Photosynthesis: Stage 2
The H+ and e- are pushed through the electron transport chain to make NADPH
NADPH is like a rechargeable battery

12. 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”

13. Photosynthesis: The Reaction
Light
(6) CO2 + (6) H2O C6H12O6 + (6) O2
Enzymes
Reactants: Carbon Dioxide & Water
Products: Glucose & Oxygen

14. 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!!