Photosynthesis: Light Dependent Reaction

Question 1

Photoionisation

Answer 1

Light energy is absorbed by the chlorophyll which excites the electrons which causes them to be released from the chlorophyll

Question 2

Electron transport chain

Answer 2

The electrons are transferred to an chain of electron carriers located in the thylakoid membrane

Question 3

the proton gradient

Answer 3

As the electrons move down the ETC, they lose energy. This pumps protons from the stroma into the thylakoids by active transport
As protons build up inside the thylakoids, a proton gradient forms across the thylakoid membrane because the concentration of protons inside the thylakoids is greater than in the stroma

Question 4

Chemiosmosis

Answer 4

The protons diffuse down the conc. gradient through ATP synthase, energy is released.
This converts ADP and inorganic phosphate to ATP

Question 5

How is reduced NAP formed

Answer 5

When light energy is absorbed, high energy electrons are released. Some electrons are transferred directly to NADP. The electrons react with proton in the stroma to produce NADPH

Question 6

Photolysis

Answer 6

Electrons can be replaced by photolysis where light energy splits water into protons, electrons and oxygen.