sec.3 photosynthesis in detail by hamdy karim
TRANSCRIPT
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4.3 Photosynthesis in Detail
Science SMART BoardKing Faisal School
Created by: Hamdy Karim
Grade level(s): 9th_Grade
Subject area: Biology
Photosynthesis in Detail
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4.3 Photosynthesis in Detail
Photosynthesis in Detail
Objectives;
Students will be able to answer the questions;
1. How does plant capture and transfer energy?
2. How does plant use energy to make sugar?
3. What is the Calvin Cycle?
Done By:
Mr. Hamdy Karim
KFS, Riyadh, KSA.
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4.3 Photosynthesis in Detail
KEY CONCEPT Photosynthesis requires a series of chemical reactions.
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4.3 Photosynthesis in Detail
The first stage of photosynthesis captures and transfers energy.
• The light-dependent reactions include groups of molecules called photosystems.
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4.3 Photosynthesis in Detail
• Photosystem II captures and transfers energy.
– chlorophyll absorbs energy from sunlight
– energized electrons enter electron transport chain
– water molecules are split
– oxygen is released as waste
– hydrogen ions are transported across thylakoid membrane
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4.3 Photosynthesis in Detail
• Photosystem I captures energy and produces energy-carrying molecules.
– chlorophyll absorbs energy from sunlight
– energized electrons are used to make NADPH
– NADPH is transferred to light-independent reactions
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4.3 Photosynthesis in Detail
• The light-dependent reactions produce ATP.
– hydrogen ions flow through a channel in the thylakoid membrane
– ATP synthase attached to the channel makes ATP
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4.3 Photosynthesis in Detail
• Light-independent reactions occur in the stroma and use CO2 molecules.
The second stage of photosynthesis uses energy from the first stage to make sugars.
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4.3 Photosynthesis in Detail
• A molecule of glucose is formed as it stores some of the energy captured from sunlight.
– carbon dioxide molecules enter the Calvin cycle– energy is added and carbon molecules are rearranged– a high-energy three-carbon molecule leaves the cycle
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4.3 Photosynthesis in Detail
– two three-carbon molecules bond to form a sugar– remaining molecules stay in the cycle
• A molecule of glucose is formed as it stores some of the energy captured from sunlight.