Light Dependent Reaction

Question 1

Where does it take place

Answer 1

In thylakoids membranes of chloroplasts

Question 2

How does LDR start

Answer 2

Light energy is absorbed by chlorophyll in the photosystems

Question 3

What does absorbing light energy cause

Answer 3

An electron to become excited and boost to a higher energy level

Question 4

What happens to the chlorophyll once an electron is excited

Answer 4

Is gets photoionised

Question 5

How does the electron release energy

What does the energy released do

Answer 5

The high energy electron is passed down a series of electron carriers
The energy is used to produce ATP

Question 6

ATP equation

Answer 6

ADP + Pi -> ATP

Question 7

What is some energy also used to do other than produce atp

Answer 7

Reduce NADP to form NADPH

Question 8

What accepts the electron at the end of the electron train

Answer 8

NADP

Question 9

Reduced NADP eq

Answer 9

NADP + H+ -> NADPH

Question 10

What do atp and NADPH transfer to the LIR

Answer 10

ATP - energy

NADPH - hydrogen

Question 11

What replaces the electron lost by the chlorophyll

Eq

Answer 11

A water molecule is split

2H2O -> 4H+ + 4e- + O2

Question 12

When a water molecule is split what happens to the oxygen and hydrogen

Answer 12

Oxygen - released as waste product

Hydrogen - protons (H+) used to reduce NADP

Question 13

What process makes ATP in LDR

Answer 13

Photophosphorylation

Question 14

3 ways the energy from photoionisation of chlorophyll is used

Answer 14

Making ATP (photophosphorylation)
Making NADPH
Splitting water into protons (H+), electrons and oxygen (photolysis)

Question 15

What’s the splitting of water called

Answer 15

Photolysis

Question 16

3 things TP and GP are converted into

Answer 16

Carbohydrates (glucose, starch, cellulose)
Lipids
Amino acids