light dependant stage - lqc 12b

Question 1

label

Answer 1

Question 2

label

Answer 2

Question 3

describe step 1

Answer 3

light hits a chlorophyll PSII molecule embedded in thylakoid membrane, 2 electrons become excited and exist at higher energy level

Question 4

describe step 2

Answer 4

electrons leave chlorophyll PSII and pass to first electron carrier in electron transport chain

Question 5

describe step 3

Answer 5

electrons pass down the electron transport chain from one electron carrier to the next in a series of redox reactions as energy level of electrons fall energy is lost

Question 6

describe step 4

Answer 6

energy is used to synthesise ATP, H+ passes through ATP synthase into stroma which results in phosphorylation of ADP this is phosphorylation and is a condensation reaction

Question 7

describe step 5

Answer 7

light hits PSI and another 2 electrons become excited and raised to higher energy level, these leave the chlorophyll and pass down the 2nd electron transport chain. 2 electrons from PSII replace those lost from PSI

Question 8

describe step 6

Answer 8

in the thylakoid space, photolysis occurs. the electrons released replace those lost from PSII, 2.5 O2 to create O2 (a waste product)

Question 9

describe step 7

Answer 9

the hydrogen ions (H+) from photolysis pass through ATP synthase and join with the electrons from the electron transport chain to reduce NADP to form reduced NADP (NADPH)