Light Dependent Reaction

• What is the role of chlorophyll in the light-dependent reaction?

  Chlorophyll absorbs light, leading to photoionisation of chlorophyll.
• What happens during the photoionisation of chlorophyll?

  Electrons are released from chlorophyll when it absorbs light.
• How is energy conserved during the light-dependent reactions?

  Some energy from electrons released during photoionisation is conserved in the production of ATP and reduced NADP.
• What is the process involved in the production of ATP during the light-dependent reactions?

  The production of ATP involves electron transfer down the electron transfer chain and the passage of protons across chloroplast membranes, catalysed by ATP synthase.
• What is the chemiosmotic theory in relation to ATP production?

  The chemiosmotic theory states that ATP production involves the transfer of electrons and the passage of protons across chloroplast membranes, catalysed by ATP synthase.
• What are the products of photolysis of water during the light-dependent reactions?

  Photolysis of water produces protons, electrons, and oxygen.
• What are the key steps in the light-dependent reactions of photosynthesis?

  • Chlorophyll absorbs light, leading to photoionisation.
  • Electrons released during photoionisation are used to produce ATP and reduced NADP.
  • ATP production involves electron transfer and proton passage across membranes, catalysed by ATP synthase (chemiosmotic theory).
  • Water is photolysed to produce protons, electrons, and oxygen.
• Light-Dependent Reaction

  Light energy is absorbed and used to generate high-energy molecules in the thylakoid membranes of the chloroplast.
• Thylakoid membranes


  Where the light-dependent reaction occurs in the chloroplast.
• Chlorophyll


  A green pigment that absorbs light energy in the light-dependent reaction.
• Pigments

  Substances that absorb light energy in the light-dependent reaction, such as chlorophyll and accessory pigments.