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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