LDR (5.7)

Question 1

State the precise site of LDR

Answer 1

The light dependent reactions occur in the thylakoid membrane which is situated within the stroma of chloroplasts

Question 2

Explain photolysis

Answer 2

It’s a chemical reaction on which organic molecules are broken down by photons. In this case with the LDR, water is broken down by light

Question 3

State the term used to describe the production of ATP using light via LDR. Explain why it is given this name.

Answer 3

The process is called photophosphorylation and it involves the use of light energy in order to change ADP into ATP (makes phosphorylation occur)

Question 4

The three products of the light dependent stage

Answer 4

ATP and NADP are useful products and the by-product is oxygen

Question 5

State the term used to describe the process by which electrons move down the electron transport chain. Explain why this term is used

Answer 5

They move down the electron transport chain through oxidative phosphorylation and this term is used because as they pass down the electron transport chain via redox reactions electrons relseade small amounts of energy that causes phosphorylation of ADP into ATP

Question 6

State the role of the three products used of the LDR

Answer 6

Oxygen is a waste product is released.
ATP and reduced NADP are used in the next process of photosynthesis called the light independent reaction to reduce GP and to regenerate RuBP

Question 7

Describe the process of the light dependent stage