2.2.2 Light Dependent Stage

Question 1

What happens when light strikes chlorophyll molecules?

Answer 1

Electrons are excited to higher energy levels

This process initiates the light-dependent reactions of photosynthesis.

Question 2

What is produced during the photolysis of water?

Answer 2

Oxygen gas, electrons, and H+ ions

Oxygen gas is released as a waste product.

Question 3

What replaces the electrons lost by chlorophyll during photolysis?

Answer 3

Electrons produced from the splitting of water

Question 4

What do excited electrons combine with to produce NADPH?

Answer 4

H+ and NADP+

Question 5

How is ATP produced in the light-dependent reactions?

Answer 5

By the transport of hydrogen ions down a gradient using ATP synthase

Question 6

What do NADPH and ATP go to after their production?

Answer 6

The Light-independent stage

Question 7

Where do the light-dependent reactions occur?

Answer 7

Grana Thylakoid Membrane

Question 8

Fill in the blank: The inputs for the light-dependent reactions include 12 H2O, 12 NADP+, and _______.

Answer 8

18 ADP+Pi

Question 9

What are the outputs of the light-dependent reactions?

Answer 9

6 O2, 12 NADPH, and 18 ATP