KEY CONCEPT The overall process of photosynthesis …

[Pages:7]4.2 Overview of Photosynthesis

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

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.

4.2 Overview of Photosynthesis

? Chlorophyll is a molecule that absorbs light energy.

? In plants, chlorophyll is found in organelles called chloroplasts.

chloroplast

leaf cell

leaf

4.2 Overview of Photosynthesis

Photosynthesis in plants occurs in chloroplasts.

? Photosynthesis takes place in two parts of chloroplasts.

? grana (thylakoids)

? stroma

grana (thylakoids) chloroplast

stroma

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

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

4.2 Overview of Photosynthesis

? The equation for the overall process is:

6CO2 + 6H2O

C6H12O6 + 6O2

granum (stack of thylakoids)

1 chloroplast

6H2O

2

6O2

thylakoid 6CO2

3

energy stroma (fluid outside the thylakoids) 1 six-carbon sugar

C6H12O6

4

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