1. Photosynthesis

2. Photosynthesis photo syn thesis photo = __________ syn = __________
Process by which autotrophs convert sunlight into sugars.
Auto = __________
Troph = __________
light
together
put
self
feed

3. What Are Autotrophs?

4. Why do we depend on plants?
They make food!
We CANNOT make our own food 
Thankfully, plants produce glucose -- a food source for all heterotrophs!
hetero = __________
troph = __________
different, other
feed

5. What Are Heterotrophs?

6. How We See Color
Sunlight is made up of ALL colors together (wavelengths).
Pigments reflect the wavelength of color that we see and absorb the other colors.

7. Why are plants green?
Chlorophyll is a pigment found in the chloroplasts of plant cells.
Chlorophyll A is the most important pigment in plants – responsible for the green color.
It reflects green and absorbs other wavelengths.
That means chlorophyll
absorbs a lot more light
than it reflects, which is
a good thing!

8. Why do leaves change color in the fall?
Why use just one wavelength of light when you can have more?
Accessory pigments absorb green and reflect other colors (e.g., red, yellow, or orange)
In autumn, leaves stop
producing new chlorophyll A, which lets the accessory pigments show through
A plant wants to take advantage of multiple wavelengths (including green), so it has other accessory pigments that reflect colors other than green. The accessory pigments absorb light that the chlorophyll can't and then gives the energy to the chlorophyll. Accessory pigments are usually red, yellow, or orange, and they are responsible for the colors of leaves in the fall. The other pigments are always there, but when the weather starts getting colder, the leaves stop making new chlorophyll, which lets the accessory pigments show through.

9. Photosynthesis
Photosynthesis harnesses the sun’s energy and stores it as chemical energy in carbohydrates.
Takes place in chloroplasts.
Light energy (wavelengths) are absorbed by the pigment chlorophyll.

10. Photosynthetic Organisms (Autotrophs)

11. Organisms that Can Photosynthesize
Plants
Algae
Some protists
Some bacteria

12. Photosynthesis Equation
Energy H2O CO C6H12O O2
Sunlight Water Carbon Dioxide Glucose + Oxygen

13. How Plants Store Energy
When chlorophyll absorbs light, it splits water into hydrogen and oxygen, and puts electrons into an excited state (they have extra energy)
As the electrons leave the excited state, they release energy and heat
The cell converts the energy into ATP and NADPH for storage
When chlorophyll absorbs light, the light splits water into H, O2, and electrons. The pigment molecule is then in an excited state (it has extra energy). As the chlorophyll leaves its excited state, it releases little packets of energy and heat.
The H adds to NAD+ to make NADPH