Sec.2 Overview of Photosynthesis by Hamdy Karim.
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Transcript of Sec.2 Overview of Photosynthesis by Hamdy Karim.
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4.2 Overview of Photosynthesis
Science SMART BoardKing Faisal School
Overview of PhotosynthesisGrade level(s): 9th_Grade
Subject area: Biology
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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
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4.2 Overview of Photosynthesis
KEY CONCEPTThe overall process of photosynthesis produces sugars that store chemical energy.
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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.
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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.
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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)
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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
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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
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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
chloroplast1
2
43
energy
stroma (fluid outside the thylakoids)