Light dependent reaction - non cyclic

What is photolysis?

Splitting of a water molecule by light energy

What is photophosphorlyation?

Making of ATP from ADP and Pi in the presence of light

What is the first stage of LDS?

Electrons in chlorophyll a in the reaction centre are excited by light energy hitting PSII and PSI

What happens after electron excitation?

2 electrons produced in photolysis decrease in their energy as they are passed through electron carriers

What is the 2nd stage of LDS?

2 electrons passed along the electron transport chain via electron carriers, losing energy as they move to the next electron carrrier

What is the 3rd stage of LDS?

They are transported to PSII and energy is released from the chain

How are the electrons lost by PSII replaced?

By 2 electrons produced in photolysis

What is the 3rd stage of LDS?

2 electrons passed along the ETC via electron carriers, they are transported to PSI

How is energy released from the chain?

As H+ ions are pumped from the stroma into the thylakoid space, creating a proton gradient

How do protons move?

Down this proton gradient through ATP synthases, which are embedded in the thylakoid membrane by chemiosmois (generating a protomotive force) and this process generates a protomotive force

What also happens in PSI?

It loses 2 electrons in the ETC, which reduces NADP to NADPH but are replaced by electrons from PSII