Light-dependent reactions

non-cyclic photophosphorylation

When electrons move straight through the ETC

Cyclic photophosphorylation

Electrons cycle through Photosystem I over and over again until they can move on. Only produces ATP

Where do the light-dependent reactions take place?

The thylakoid of the chloroplasts

How do the light dependent reactions work?

Sunlight provides the energy to oxidize water into oxygen, H+ ions, and electrons. The light is absorbed by the chlorophyll in Photosystem II. Electrons move from Photosystem II to the proton pump. This powers H+ ions to form a gradient and the ion move into the thylakoid. The electrons then move to Photosystem I and then NADP reductase. NADP Reductase reduces NADP into NADPH. The H+ ions move from the inside of the thylakoid to ATP Synthase, where it powers the enzyme to produce ATP

What are the products and reactants of the LDR?

Reactants- Water

Products- NADPH and ATP which move on to the Calvin Cycle, and oxygen which is released