Photosynthesis

Question 1

Where does LDR + LIR occur

Answer 1

LDR = Thylakoids
LIR = Stroma

Question 2

Role of light in photoionisation

Answer 2

Chlorophyll absorbs photons + two e- become excited and leave the chlorophyll

Question 3

What happens in the electron tranport chain

Answer 3

E- released from the chlorophyll move down a series of carrier proteins embedded in the thylakoid membrane and undergo a series of redox reactions which releases energy

Question 4

How are ATP produced

Answer 4

During chemiosmosis H= move down their concentration gradient from the thylakoid space into the stroma via the channel protein ATP synthase, which catalyses ADP+ P

Question 5

What happens during photolysis

Answer 5

Light energy splits water into hydrogen ion, electrons and oxygen

Question 6

Where and how is NADPH formed in LDR

Answer 6

In the stroma of chloroplast NADP combines with H+ and E- to form NADPH which is catalysed by dehydrogenase

Question 7

Process of calvin cycle

Answer 7

1. RuBp combines with CO2 which is catalysed by Rubisco to form an unstable 6C compund which immediaely breaks down into x2 GP (3C).
2. GP is reduced by X2 ATP + NADPH to form triose phosphate
3. Triose phosphate then goes to form hexose sugar or reform RuBp when 1CO2 leabes the cycle
4. Two GPs and TP to make one glucose molecule.