Light dependant Reaction

Question 1

what is photoionisation?

Answer 1

light is absorbed by the chlorophyll and 2 electrons are excited and leave the chlorophyll
Chlorophyll becomes oxidised or ionised
the 2 electrons are passed to the electron acceptor

Question 2

what is phosphorylation of ATP?

Answer 2

from the electron acceptor, the 2 electrons are passed to the electron transfer chain via a series of redox reactions
as these electrons are transferred energy is released and this energy is used to pump (actively transport) hydrogen ions into the thylakoid lumen so there is now a proton or electrochemical gradient
because of this gradient the hydrogen ions will diffuse back the stroma through a channel in the ATP synthase enzyme

Question 3

what is chemiosmosis?

Answer 3

when the hydrogen ions pass through the ATP synthase channel, ADP and inorganic ions create ATP molecules

Question 4

what is photolysis of water?

Answer 4

when water is split by light into 2 hydrogens, 2 electrons and 1/2 of an oxygen
the electrons replace the 2 excited electrons that left the chlorophyll in photoionisation
the 2 hydrogens help to create the proton gradient in the thylakoid lumen
the oxygen is a waste product and leaves the leaf via the stomata

Question 6

Where does the LDR take place?

Answer 6

the thylakoid membrane