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Questions and Answers
What is the overall reaction for photosynthesis?
What is the overall reaction for photosynthesis?
6 CO2 + 6 H2O + Light => C6H12O6 + 6 O2
Explain what an absorption spectrum shows and how it is relevant to photosynthesis.
Explain what an absorption spectrum shows and how it is relevant to photosynthesis.
The absorption spectrum shows the type of light absorbed by the thylakoids during photosynthesis, with red and blue light being absorbed the most.
What wavelengths of light are most effective in driving photosynthesis?
What wavelengths of light are most effective in driving photosynthesis?
Blue and red.
Explain why the leaves of deciduous trees change colors in autumn. Use specific names of pigments in your response.
Explain why the leaves of deciduous trees change colors in autumn. Use specific names of pigments in your response.
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Where do the light reactions take place?
Where do the light reactions take place?
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Where does the Calvin Cycle take place?
Where does the Calvin Cycle take place?
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What is the primary function of the light reactions?
What is the primary function of the light reactions?
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What is the primary function of the Calvin Cycle?
What is the primary function of the Calvin Cycle?
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What is the final electron acceptor in photosystem I?
What is the final electron acceptor in photosystem I?
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In the process of carbon fixation, what more needs to happen to complete the Calvin cycle?
In the process of carbon fixation, what more needs to happen to complete the Calvin cycle?
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Assume a thylakoid is somehow punctured. What process would this damage most directly affect?
Assume a thylakoid is somehow punctured. What process would this damage most directly affect?
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What is the flow of electrons starting with H2O?
What is the flow of electrons starting with H2O?
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Where does the oxygen produced by photosynthetic plants originate?
Where does the oxygen produced by photosynthetic plants originate?
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From which molecule do the photosystem II replacement electrons come?
From which molecule do the photosystem II replacement electrons come?
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What products of the light reactions of photosynthesis are utilized in the Calvin cycle?
What products of the light reactions of photosynthesis are utilized in the Calvin cycle?
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When oxygen is released as a result of photosynthesis, it is a direct by-product of what process?
When oxygen is released as a result of photosynthesis, it is a direct by-product of what process?
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What related function do carotenoids have in plants?
What related function do carotenoids have in plants?
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Predict what the relative dissolved oxygen concentrations will be in the flask with algae compared to the control flask.
Predict what the relative dissolved oxygen concentrations will be in the flask with algae compared to the control flask.
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What happens to the energy as electrons are passed through the system of electron carriers associated with photosystem II?
What happens to the energy as electrons are passed through the system of electron carriers associated with photosystem II?
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Study Notes
Photosynthesis Overview
- Overall reaction: 6 CO2 + 6 H2O + Light => C6H12O6 + 6 O2
- Light reactions occur in thylakoids, while the Calvin cycle takes place in the stroma.
Absorption Spectrum and Light Wavelengths
- An absorption spectrum illustrates how much light is absorbed by thylakoids, indicating red and blue light are most effective for photosynthesis.
- Wavelengths that drive photosynthesis effectively are blue and red.
Leaf Color Change in Autumn
- Deciduous trees stop producing chlorophyll as days shorten, revealing other pigments like carotenoids, resulting in color changes in leaves.
Functions of Photosynthetic Processes
- Light reactions produce ATP and NADPH and release O2, essential for the Calvin cycle.
- Calvin cycle's primary function is to synthesize simple sugars (glucose) and regenerate RuBP.
Electron Flow and By-products
- The flow of electrons starts from H2O, proceeding through the electron transport chain (ETC) to NADPH and then to the Calvin cycle.
- Oxygen produced during photosynthesis originates from the splitting of water molecules in light reactions.
Photosystem and Electron Replacement
- In photosystem II, replacement electrons come from water molecules after they are excited and passed to carriers.
Impact of Damage to Thylakoids
- A punctured thylakoid, leading to the mixing of thylakoid and stroma, would directly affect ATP synthesis.
Key Products and Functions
- The main products of light reactions utilized in the Calvin cycle are ATP and NADPH.
- Electrons pass through photosystem II, releasing their energy to create an ion gradient and energizing ion pumps.
Antioxidant Properties
- Carotenoids, present in antioxidant-rich foods, absorb excess energy in plants, contributing to their health and photosynthesis efficiency.
Oxygen Production in Algal Studies
- Photosynthetic green algae will produce higher dissolved oxygen levels compared to a control flask with water, demonstrating the efficacy of photosynthesis under light cycles.
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Description
Prepare for your biology exam with these flashcards focusing on Chapter 10 topics related to photosynthesis. Review the overall photosynthesis reaction and the importance of absorption spectra in understanding how plants harness light energy. Test your knowledge and get ready for success!
