Reactions of Photosynthesis

When a chlorophyll molecule absorbs light:

• it absorbs all wavelengths of light

• it disintegrates (breaks down)

• it absorbs mostly green light

• some of its electrons are excited to a higher energy level

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When electrons of a chlorophyll molecule are excited to a higher level:

• they enter an electron transport chain

• they reflect excess sunlight

• carotenoids are converted into chlorophyll

• they enter the Calvin cycle

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What is the source of oxygen produced in photosynthesis?

• carbon dioxide

• glucose

• water

• air

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The Calvin cycle begins when a molecule of _________ __________ is added to a 5-carbon compound and ends with three-carbon sugars.

• carbon dioxide

• acetyl-coA

• NADP+

• excited electrons

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During the light reactions:

• carbon dioxide is fixed

• ATP and NADPH are formed

• sugar is created

• carbon dioxide accepts electrons

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Which of the following is required for the light dependent reactions to occur? Choose two

• sunlight

• water

• carbon dioxide

• ATP & NADPH

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Which of the following is required for the Calvin cycle?

• carbon dioxide

• oxygen

• NADP+

• FADH2

The electron transport chain produces:

• carbon dioxide and water

• ATP and water

• ATP and NADPH

• NADH and FADH2

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What two reactants of photosynthesis are used for the light dependent reactions?

• carbon dioxide, water

• water, sunlight

• carbon dioxide, sunlight

• glucose, sunlight

Closely examine the following statements next to each of the numbers. Choose which option best describes the order of the steps in photosynthesis.

1. Electrons increase in energy level.

2. ATP and NADPH are formed.

3. Chlorophyll absorbs light energy.

4. Electrons enter an electron transport chain.

5. ATP and NADPH are used to drive reactions in the Calvin cycle.

6. Glucose is formed.

• 1, 3, 6, 5, 2, 4

• 3, 1, 4, 2, 5, 6

• 2, 4, 1, 3, 5, 6

• 3, 1, 2, 5, 4, 6

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