Podcast
Questions and Answers
During the light-dependent reactions of photosynthesis, what is the primary role of water molecules?
During the light-dependent reactions of photosynthesis, what is the primary role of water molecules?
- To be split, providing electrons and hydrogen ions, and releasing oxygen. (correct)
- To combine with carbon dioxide to form starch.
- To absorb light energy and transfer it to chlorophyll.
- To directly fix carbon dioxide into glucose.
Which of the following best describes the relationship between the light-dependent and light-independent (dark) reactions of photosynthesis?
Which of the following best describes the relationship between the light-dependent and light-independent (dark) reactions of photosynthesis?
- The light-independent reactions produce oxygen, which is essential for the light-dependent reactions.
- The light-dependent reactions produce ATP and NADPH, which are then used in the light-independent reactions to reduce carbon dioxide. (correct)
- The light-dependent and light-independent reactions occur simultaneously and independently of each other.
- The light-dependent reactions produce glucose, which is then used to power the light-independent reactions.
If a plant were exposed to a toxin that inhibits the function of photosynthetic enzymes in the stroma, which of the following would be the most direct consequence?
If a plant were exposed to a toxin that inhibits the function of photosynthetic enzymes in the stroma, which of the following would be the most direct consequence?
- Reduced production of ATP and NADPH.
- Increased release of oxygen into the atmosphere.
- Decreased absorption of light energy by chlorophyll.
- Inability to convert carbon dioxide into glucose. (correct)
During photosynthesis, what is the ultimate fate of the electrons that are excited in chlorophyll molecules by light energy?
During photosynthesis, what is the ultimate fate of the electrons that are excited in chlorophyll molecules by light energy?
How does the release of oxygen during the light-dependent reactions directly benefit other life forms?
How does the release of oxygen during the light-dependent reactions directly benefit other life forms?
Flashcards
What is the light reaction?
What is the light reaction?
The process where light energy is captured by chlorophyll in the grana.
What is photolysis?
What is photolysis?
Splitting of water molecules into hydrogen and hydroxyl ions, powered by light energy.
What is the stroma?
What is the stroma?
The location where the dark reaction (Calvin Cycle) takes place.
What is the dark reaction (Calvin Cycle)?
What is the dark reaction (Calvin Cycle)?
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What is starch's role in photosynthesis?
What is starch's role in photosynthesis?
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Study Notes
- Photosynthesis includes both light and dark reactions
- The light reaction occurs in the grana
- The dark reaction takes place in the stroma
Light Reaction
- Chlorophyll in chloroplasts captures blue and red light, Light-dependent reactions generate ATP and NADPH; Calvin Cycle follows.The dark reaction in the stroma, using hydrogen atoms and carbon dioxide, produces glucose, which is stored as starch.
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Description
Photosynthesis involves light and dark reactions. The light reaction happens in the grana, where chlorophyll captures light energy and splits water molecules. The dark reaction, also known as the Calvin Cycle, takes place in the stroma, fixing carbon dioxide using hydrogen atoms released during the light reaction.
