Chapter 4 Lesson 2: Light Dependent Reactions Lecture Review

Label the structures in light-dependent reactions.

b

c

d

e

a

Stroma

Thylakoid Space

ATP Synthase

Photosystem I

Photosystem II

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Organize the options into reactants and products for light dependent reactions.

Groups:

(a) Reactants

,

(b) Products

,

(c) Not part of Light Dependent Reactions

• water

• carbon dioxide

• oxygen

• ATP

• NADPH

• glucose

• NADP+

• ADP

Match the following parts of water with their function in light dependent reactions.

• Electrons (e-)

• Released as a byproduct

• Oxygen

• Replace those that were used in the chlorophyll at photosystem II

• Hydrogen Ions (H+)

• Build up in the thylakoid space to create a concentration gradient that will cause ATP synthase to rotate and add a phosphate to ADP to form ATP

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When water breaks down, hydrogen ions are built up in the thylakoid space to create a concentration gradient for ATP Synthase. Mark the location where additional H+ are added.

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Select ATP Synthase where ATP is produced.

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At the end of the electron transport chain, electrons are picked up by the electron carrier to form NADPH which will then go to light-independent reactions.

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Select the 2 locations where electrons in the chlorophyll are energized by sunlight.

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What happens at Photosystems I and II in light-dependent reactions?

• Photosystems I and II absorb light energy to energize electrons.

• Photosystem II transports H+ ions across the thylakoid membrane for ATP producing process

• Photosystem I produces ATP from ADP.

• Both Photosystem I and II produce NADPH and ATP for light-independent reactions.

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Put the steps of ATP production in order.

• Water is broken down.

• ATP Synthase rotates & adds a phosphate to ADP to form ATP.

• A concentration gradient forms between the thylakoid space and the stroma.

• H+ Ions move through APT synthase.

• H+ ions build up in the thylakoid space.

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Which two products of light-dependent reactions are used in light-independent reactions (the Calvin Cycle) to create sugar?

• Oxygen & ATP

• ATP & NADPH

• ADP & NADP+

• Carbon Dioxide and Oxygen