1. 11/14/2018
Photosynthesis

2. The Process of Photosynthesis
11/14/2018
The Process of Photosynthesis
Photo means light and synthesis means putting together

3. How Does Photosynthesis Help Us?
11/14/2018
How Does Photosynthesis Help Us?
During photosynthesis oxygen is released into the air
When we breath air, we take in oxygen and release carbon dioxide
Plants take in carbon dioxide and release oxygen
-From sunlight green plants combine carbon dixiode and water to make sugar and oxygen.
-Green plants use sugar to make starch, fats and proteins.

4. How do Plants Produce Their Own Food?
11/14/2018
How do Plants Produce Their Own Food?
Most plants can produce all their own food because they contain a pigment called chlorophyll
Chlorophyll is a substance that makes the leaves of most plants green
Green plants use chlorophyll to capture sunlight
Then they use the energy from sunlight to make food.

5. What is Sunlight? Energy from the sun travels in the form of waves
11/14/2018
What is Sunlight?
Energy from the sun travels in the form of waves
Plants have several different pigments in order to capture and use the maximum amount of energy

6. 11/14/2018
Why are plants GREEN?
Chlorophyll absorbs only certain wavelengths of light
If a plant does not contain a pigment to absorb a specific color, then that wavelength will be reflected by the plant and that is the color they will appear
Which ones does it not absorb?
Be sure to explain the presence of different pigments with different absorption spectra

7. The Chemistry of Photosynthesis
11/14/2018
The Chemistry of Photosynthesis
CO2 + H2O + light Energy------> O2 + C6H12O6
Or, in common terms:
REACTANTS: molecules of carbon dioxide react with molecules of water and light energy
PRODUCTS: oxygen and a molecule of glucose (a sugar)

8. 11/14/2018
Light & Dark Reactions
The process of Photosynthesis consists of 2 major series of reactions
Light Dependent reactions
Light Independent reactions
aka: the Calvin Cycle

9. Light Reactions Require light energy
11/14/2018
Light Reactions
Require light energy
Water is converted to oxygen (the hydrogen atoms are removed and the H (hydrogen) is added to the electron carrier NADP to make NADPH)
ATP and NADPH (an electron carrier) are produced

10. Light Reactions Who: light energy and water
11/14/2018
Who: light energy and water
What: light energy is used to convert water to oxygen and
the energy released from breaking the bond is used
to create ATP
When: 1st stage of photosynthesis
Where: in the thylakoid membrane of a chloroplast in
PLANT cells
Why: to make ATP and release oxygen

11. Dark (Calvin) Reactions
11/14/2018
Dark (Calvin) Reactions
Do NOT require light energy
carbon dioxide (CO2) is converted to glucose (C6H12O6)
this cycle uses energy from light reactions (ATP & NADPH) so no light energy is required! For this reason this reaction is said to be light independent

12. Calvin Cycle Who: carbon dioxide, ATP and NADPH
11/14/2018
Calvin Cycle
Who: carbon dioxide, ATP and NADPH
What: the ATP energy made in the light reactions is used to combine the hydrogen in NADPH and the carbon and oxygen in carbon dioxide to make glucose (C6H12O6)
When: 2nd stage of photosynthesis
Where: in the stroma of the chloroplast
Why: to make glucose!

13. How do Photosynthesis and Cellular Respiration relate?
11/14/2018
How do Photosynthesis and Cellular Respiration relate?