1. Photosynthesis

2. Photosynthetic organisms are producers …
Produce their own energy by harvesting sunlight
The sunlight is converted into chemical energy in form of sugars (Food)
Sugars are made through Photosynthesis….

3. Chloroplasts Chlorophyll Pigment in the Chloroplast
Found in the palisade mesophyll
Converts light energy into Food
Absorbs some of the visible light
Visible light looks white, but has different colors: blue, red & green

4. Chlorophyll Plants have 2 types of chlorophyll
Chlorophyll a
Chlorophyll b
These 2 types of chlorophyll absorb RED and BLUE wavelength of light.
Neither type absorbs green light.
Plants are green because green light is reflected back into the environment… giving them a green appearance!

5. What is the role of Chlorophyll in Photosynthesis?
Chlorophyll a and b absorb the red and blue sunlight, harvesting the Energy for Photosynthesis

6. Chloroplasts
Place of Photosynthesis (Sun energy -> Food)

7. Chloroplasts Chloroplasts are plant cell organelles.
Two main parts of chloroplasts are needed for photosynthesis:
Granum (Plural: Grana)
Stacks of compartments (Thylakoid)
Thylakoids are stacked like coins
Thylakoids contain chlorophyll a & b
Stroma
Fluid in chloroplast
Grana float in stroma

8. 2 stages of Photosynthesis
Light-dependent
Sunlight is needed
Light –independent
No light is needed

9. Light – dependent reaction
Captures energy from the sunlight
These reactions happen in the thylakoids

10. Light- dependent reaction
The sun energy is transferred to an energy molecule called ATP.
During this process:
water (H2O) are broken down
oxygen (O2) are produced
and Energy (ATP) is made
6 CO2 + 6 H2O  C6H12O6 + 6 O2

11. Photosynthesis

12. Light- independent reaction
Uses the ATP (energy) from the light –dependent reaction to make sugars.
The light-independent reaction (Calvin Cycle ) occurs in the Stroma.
During this process:
Carbon dioxide (CO2) & ATP are used to
build sugar (C6H12O6)
6 CO2 + 6 H2O  C6H12O6 + 6 O2

13. Photosynthesis
6 CO2 + 6 H2O  C6H12O6 + 6 O2