Section 5

Question 1

Which chemical are required for the light-dependant reaction?

Answer 1

NADP, ADP, Pi, water

Question 2

Describe what happens during photoionisation in the light-dependent
reaction

Answer 2

• Light energy excites electrons in chlorophyll
• Electrons leave chlorophyll

Question 3

What is the photolysis of water?

Answer 3

Light energy absorbed by chlorophyll is used to split water molecules into H+, e- ions and oxygen

Question 4

What happens during chemiosmosis?

Answer 4

• Electrons move into electron carrier chain in thylakoid membrane
• Electrons release energy into proteins that pump protons across membrane
• Electrochemical gradient created
• Protons pass through ATP synthase, which causes ATP production
• Protons combine with coenzyme NADP to become NADPH