[Biology][Practical-16] Photososynthesis Questions


  • Phtosynthesis occurs in the chloroplast

  • What is the general reaction of photosynthesis?


  • What are the differences between cyclic and non cyclic photophosporylation?


  • What are the 2 phases of photosynthesis?
  1. light dependant reactions
  2. light-independent reactions
  • What are the 3 steps of photosynthesis?

1. light excites chlorophyll electrons and they become energized
2. excited electrons pass through electron transport chain, making ATP via chemiosmosis
3. electrons may reduce NADP+ and be replaced by photolysis of water

  • What happens in light dependant reactions?
  • Photosystems are photosynthetic pigments embedded within the thylakoid membrane

  • In cyclic photophosphorylation, only PSI is involved, water is not required oxygen is not evolved, and NADPH is not synthesized

  • Cyclic photophosphorylation is used to produce additional ATP in order to meet cell energy demands

  • In non-cyclic photophosphorylation, PSI and PSII are involved, photolysis of water is required, oxygen is devolved, and NADH is synthesized

  • Photosystem I absorbs light at 700nm and photosystem II absorbs light at 680nm

  • What are the steps of the Calvin cycle?

  • Carboxylation of ribulose bisphosphate
  • Reduction of glycerate-3-phosphate
  • Regeneration of ribulose bisphosphate
  • The proton gradient will be used by ATP synthase to create ATP from ADP+Pi

  • What happens in light-independent reactions?

It is the Calvin cycle


the last picture showing the calvin cycle, why is it 3 Co2 and 3 RuBP represented, i mean 6 co2 and 6 RuBP is required to produce 1 glucose right, and normal cycle is represented with 1 co2 and 1 rubp so why 3?

in the last question of calvin cycle…the diagram is showing the utilization of 6atp to convert ribulose 5- phosphate to RuBP but i think that there should be a utilization of 3 atp instead of 6…correct me if im wrong

1 Like