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C1.3 HL Light Dependent Reactions
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Total cards: 8•Content version: v3•Public deck•Updated: 8/1/2026
Card preview (8)
#1
Front (Question)
Where do LDR occur?
Back (Answer)
Thylakoid membranes.
#2
Front (Question)
What happens at PSII?
Back (Answer)
Light excites electrons; water is split to replace them.
#3
Front (Question)
What happens along the electron transport chain?
Back (Answer)
Electron energy pumps H⁺ into lumen, forming a proton gradient.
#4
Front (Question)
How is ATP made?
Back (Answer)
H⁺ flow through ATP synthase (chemiosmosis).
#5
Front (Question)
What happens at PSI?
Back (Answer)
Electrons are re-excited and used to reduce NADP⁺ → NADPH.
#6
Front (Question)
Why does cyclic photophosphorylation occur?
Back (Answer)
Provides extra ATP when Calvin cycle needs more ATP than NADPH.
#7
Front (Question)
What is photolysis?
Back (Answer)
Splitting of water → electrons, protons, oxygen.
#8
Front (Question)
Why is the lumen acidic?
Back (Answer)
Accumulation of H⁺ from pumping + photolysis.