Students will study that plants are producers, the location of Photosynthesis, and the Light-Dependant Reaction of Photosynthesis!

1. 4.2 Overview of Photosynthesis
Science SMART Board
King Faisal School
Overview of Photosynthesis
Grade level(s): 9th_Grade
Subject area: Biology

2. 4.2 Overview of Photosynthesis
Objectives;
Students will be able to
answer the questions;
1. Why do photosynthetic organisms
describe as Producers?
2. Where does photosynthesis occur?
3. What is the light-Dependent
reaction of Photosynthesis?
Done By:
Mr. Hamdy Karim
KFS, Riyadh, KSA.
Overview of Photosynthesis

3. 4.2 Overview of Photosynthesis
KEY CONCEPT
The overall process of photosynthesis produces
sugars that store chemical energy.

4. 4.2 Overview of Photosynthesis
Photosynthetic organisms are producers.
• Producers make their own
source of chemical energy.
• Plants use photosynthesis and
are producers.
• Photosynthesis captures energy
from sunlight to make sugars.

5. 4.2 Overview of Photosynthesis
• Chlorophyll is a molecule that
absorbs light energy. chloroplast
leaf cell
leaf
• In plants, chlorophyll is
found in organelles called
chloroplasts.

6. 4.2 Overview of Photosynthesis
Photosynthesis in plants occurs in chloroplasts.
• Photosynthesis takes place in two parts of chloroplasts.
– grana (thylakoids)
– stroma
chloroplast
stroma
grana (thylakoids)

7. 4.2 Overview of Photosynthesis
• The light-dependent reactions capture energy from sunlight.
– take place in thylakoids
– water and sunlight are needed
– chlorophyll absorbs energy
– energy is transferred along thylakoid membrane then to
light-independent reactions
– oxygen is released

8. 4.2 Overview of Photosynthesis
• The light-independent reactions make sugars.
– take place in stroma
– needs carbon dioxide from atmosphere
– use energy to build a sugar in a cycle of chemical
reactions

9. 4.2 Overview of Photosynthesis
• The equation for the overall process is:
6CO2 + 6H2O →→→→→→ C6H12O6 + 6O2
C6H12O6
granum (stack of thylakoids)
thylakoid
sunlight
1 six-carbon sugar
6H2O
6CO2
6O2
chloroplastchloroplast1
2
43
energy
stroma (fluid outside the thylakoids)

10. 4.2 Overview of Photosynthesis
• The equation for the overall process is:
6CO2 + 6H2O →→→→→→ C6H12O6 + 6O2
C6H12O6
granum (stack of thylakoids)
thylakoid
sunlight
1 six-carbon sugar
6H2O
6CO2
6O2
chloroplastchloroplast1
2
43
energy
stroma (fluid outside the thylakoids)