photosynthesis

Question 1

where does LDR take place

Answer 1

in thylakoid membranes of chloroplasts

Question 2

describe photoionisation

Answer 2

1) chlorophyll absorbs light
2) excited electrons to higher energy level
3) electrons are lost from chlorophyll

Question 3

describe photophosphorylation in LDR

Answer 3

• energy released by electrons as they pass down the ETC by redox reactions, is used to pump protons (H+) across thylakoid membrane, into thylakoid
• forming proton electrochemical gradient
• protons diffuse down electrochemical gradient through ATP synthase, catalysing ADP + Pi -> ATP

Question 4

describe photolysis in LDR

Answer 4

• light splits 2H20 -> 4H+ +4e- + O2
• e- replace electrons in chlorophyll
• H+ and NADP act as an electronic acceptor for electron at end of ETC forming NADPH (reduced NADP)