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Questions and Answers
Where are photosystems located?
Where are photosystems located?
- On the outside of the thylakoid membrane
- Inside the thylakoid membrane (correct)
- In the intermembrane space
- In the light dependent reactions
What happens when a photosystem absorbs light energy?
What happens when a photosystem absorbs light energy?
- The electrons become energised (correct)
- The electrons are transferred to carrier molecules
- ATP and NADPH are produced
- The light independent reactions occur
What is the purpose of the light dependent reactions?
What is the purpose of the light dependent reactions?
- To generate energy for the light independent reactions (correct)
- To absorb light energy
- To produce ATP and NADPH
- To transfer electrons to carrier molecules
What is the role of Photosystem I and II?
What is the role of Photosystem I and II?
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Which of the following is NOT true about photosystems?
Which of the following is NOT true about photosystems?
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Study Notes
- Photosystems are groups of photosynthetic pigments that are embedded within the thylakoid membrane.
- When a photosystem absorbs light energy, delocalised electrons within the pigments become energised or ‘excited'.
- These excited electrons are transferred to carrier molecules within the thylakoid membrane, and are used in the light dependent reactions.
- The light dependent reactions occur within the intermembrane space of the thylakoids, and involve the production of ATP and NADPH.
- The light dependent reactions are used to generate energy for the light independent reactions.
- The light dependent reactions are carried out by Photosystem I and Photosystem II, and are dependent on the light that is absorbed.
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