Photosystem and Light Dependent Reactions Quiz

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Questions and Answers

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?

  • 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?

  • 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?

<p>To generate energy for the light independent reactions (D)</p> Signup and view all the answers

Which of the following is NOT true about photosystems?

<p>They are used to generate energy for the light independent reactions (D)</p> Signup and view all the answers

Flashcards

Location of photosystems?

Inside the thylakoid membrane.

Result of photosystem absorbing light energy?

The electrons become energised.

Purpose of the light dependent reactions?

To generate energy for the light independent reactions.

Role of Photosystem I and II?

To generate energy for the light independent reactions.

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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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