Photosynthesis: Part 4: Light Dependent Reactions

Question 1

What are Photosystems?

Answer 1

Hundred of light absorbing complexes located in the Thylakoids.

Question 2

What are the results of the Light Dependent reactions

Answer 2

• Produce ATP

- Provide protons for the Calvin Cycle in the light independent reactions.

Question 3

What is the process of the Light Dependent reaction?

Answer 3

Light——> chlorophyll———->energized electrons—–> ETC———–>proton gradient——->ATP synthetase—-> ATP

Question 4

What is the function of Water in the Light Dependent reaction?

Answer 4

Water breaks down by a process called Photolysis. It divides into Protons, Electrons, and Oxygen. Each have a role in making sugar:
Electrons: replace lost electrons by chlorophyll during light dependent reactions.
Protons: pass through ATP synthetase channels and get carried by NADP to the stroma for light independent reactions.
Oxygen: Released to the atmosphere as a waste product, source of all our oxygen in the atmosphere.