light dependent reaction

Question 1

what happens to the light

Answer 1

it is absorbed by the chlorophyll in the photostems

Question 2

what happens to the electrons

Answer 2

they are excited to a energy level and emmited from the chlorophyll so oxidising the chlorophyll and taken up by electron carrier on thylakoid membrane

Question 3

what happens to an electron in a chlorophyll

Answer 3

moves down an electron carrier chain , energy is released which is used to combine adp and pi to form atp in a process called photophosphorylation

Question 4

what does the photolysis main role

Answer 4

provide electrons to replace the lost one from the chlorophyll

Question 5

what happens to the left over hydrogen ion

Answer 5

used to reduce nadp to nadph to be used in the light independent reaction in the addition of electrons as well

Question 6

how do the hydrogen ions get transported

Answer 6

electron carriers releasing energy as they go which pumps protons form stroma to lumen of thylakoid it creates higher concentration in the thylakoids so create a concentration gradient

Question 7

how does the hydrogen ions move

Answer 7

down a concentration gradient from high to low from the thylakoids to the stroma through the atp synthase channel

Question 8

what is special about the atp synthase channel

Answer 8

it changes structure as the hydrogen ions pass through and then catalyses the reaction between adp and phosphate to create atp

Question 9

what happens to the oxygen in the last stage of photolysis

Answer 9

it either diffuse out through stomata or it is used during respiration

Question 10

what do protiens in grana do

Answer 10

it holds the thylakoids in a manner which maximises the absorption of light.

Question 11

what does atp synthase allow

Answer 11

the production of atp which catalyses the production of atp and also maintains active transport in proton pump