1. KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy.

2. 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.

3. Chlorophyll is a molecule that absorbs light energy.
chloroplast
leaf cell
leaf
In plants, chlorophyll is found in organelles called chloroplasts.

4. Photosynthesis in plants occurs in chloroplasts.
Photosynthesis takes place in two parts of chloroplasts.
grana (thylakoids)
stroma
chloroplast
stroma
grana (thylakoids)

5. 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

6. 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

7. 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
chloroplast 1 2 4 3
energy
stroma (fluid outside the thylakoids)

8. Which of the following statements best describes the process of photosynthesis?
Plants use oxygen to make simple sugars.
Chlorophyll builds sugars in the thylakoid membrane.
Light breaks down water molecules and releases carbon dioxide.
Chloroplasts absorb sunlight and store chemical energy.

9. What is the term for an organism that makes its own source of chemical energy?
Decomposer
Producer
Chloroplast
Protist

10. The main light-absorbing molecules found in plant leaves are called
Chloroplasts
Thylakoids
Chlorophyll
Grana

11. The function of light-dependent reactions is to
Build sugars
Capture and transfer energy
Release carbon dioxide
Form water molecules

12. The light-independent reactions of photosynthesis need
Carbon dioxide
Oxygen
Water
Cellulose