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Questions and Answers
During the light reactions of photosynthesis, what is the initial event that occurs when light strikes the leaves?
During the light reactions of photosynthesis, what is the initial event that occurs when light strikes the leaves?
- Chlorophyll in the chloroplasts absorbs the light energy. (correct)
- Water molecules are immediately split into hydrogen and oxygen.
- Oxygen is released through the stomata.
- ADP is converted into ATP.
What is the primary role of light energy in the light reactions of photosynthesis?
What is the primary role of light energy in the light reactions of photosynthesis?
- To directly fix carbon dioxide into glucose.
- To synthesize ATP from carbon dioxide.
- To convert NADPH back into NADP+.
- To split water molecules and energize electrons. (correct)
How is ATP generated during the light reactions of photosynthesis?
How is ATP generated during the light reactions of photosynthesis?
- Through the breakdown of glucose molecules.
- By adding a phosphate group to ADP, using light energy. (correct)
- By directly combining carbon dioxide and water.
- By releasing oxygen from water molecules.
What is the role of NADP+ in the light reactions of photosynthesis?
What is the role of NADP+ in the light reactions of photosynthesis?
What is the ultimate fate of the oxygen produced during the light reactions?
What is the ultimate fate of the oxygen produced during the light reactions?
Why are NADPH and ATP crucial for the dark reactions of photosynthesis?
Why are NADPH and ATP crucial for the dark reactions of photosynthesis?
What is the correct sequence of events in the light reactions?
What is the correct sequence of events in the light reactions?
In which specific location within the plant cell do the light reactions of photosynthesis take place?
In which specific location within the plant cell do the light reactions of photosynthesis take place?
How does the splitting of water molecules contribute to the light reactions?
How does the splitting of water molecules contribute to the light reactions?
What is the immediate product when hydrogen is added to NADP+ during the light reactions?
What is the immediate product when hydrogen is added to NADP+ during the light reactions?
Why is the release of oxygen from the leaves an important outcome of the light reactions for other living organisms?
Why is the release of oxygen from the leaves an important outcome of the light reactions for other living organisms?
What form of energy is primarily captured by chlorophyll during the light reactions?
What form of energy is primarily captured by chlorophyll during the light reactions?
How does the conversion of ADP to ATP directly benefit the plant cell?
How does the conversion of ADP to ATP directly benefit the plant cell?
What would happen if the light energy was not absorbed by chlorophyll in the first step of the light reactions?
What would happen if the light energy was not absorbed by chlorophyll in the first step of the light reactions?
How does the diagram represent the movement of oxygen molecules during the light reactions?
How does the diagram represent the movement of oxygen molecules during the light reactions?
Based on the diagram, where does the splitting of water molecules occur during the light reactions?
Based on the diagram, where does the splitting of water molecules occur during the light reactions?
Considering the energy transformations in light reactions, what signifies that NADPH and ATP are energy-rich compounds?
Considering the energy transformations in light reactions, what signifies that NADPH and ATP are energy-rich compounds?
If a plant cell is deficient in phosphate, which of the light-dependent reaction products would be most immediately affected?
If a plant cell is deficient in phosphate, which of the light-dependent reaction products would be most immediately affected?
How does the cyclical nature of ADP and ATP contribute to the continuity of light reactions?
How does the cyclical nature of ADP and ATP contribute to the continuity of light reactions?
Which of the following best describes the interdependence of light and dark reactions in photosynthesis?
Which of the following best describes the interdependence of light and dark reactions in photosynthesis?
Flashcards
Light energy absorption
Light energy absorption
Light energy is absorbed by chlorophyll; used in two ways.
Water splitting
Water splitting
Light splits water into hydrogen and oxygen.
NADPH Formation
NADPH Formation
The hydrogen produced is added to NADP+ to create NADPH.
ATP Synthesis
ATP Synthesis
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Role of NADPH and ATP
Role of NADPH and ATP
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Light reactions
Light reactions
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Water-splitting Step
Water-splitting Step
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ATP Creation
ATP Creation
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Light Reaction Products
Light Reaction Products
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Study Notes
The Light Reactions
- When light strikes leaves, chlorophyll in chloroplasts absorbs it.
- Light energy splits water into oxygen and hydrogen.
- Oxygen releases during this process.
- This photosynthesis part is called the light reactions because these steps occur only in the presence of light.
The 4 Steps of Light Reactions
- Light energy is absorbed by the chlorophyll in the leaf and used in two ways.
- Light energy splits water molecules into hydrogen and oxygen.
- Hydrogen produced is added to NADP+ (already in leaf cells) to make NADPH and oxygen is released by the leaf.
- Absorbed light energy adds a phosphate group to ADP (also already in leaf cells) to make ATP.
- NADPH, ATP, and oxygen are the products of the light reactions.
- NADPH and ATP are energy-rich compounds needed for dark reactions in photosynthesis.
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