Photosynthesis Quiz

In photosynthesis, which molecule is oxidized?

• Carbon dioxide (CO₂)

• Water (H₂O)

• Glucose

• Oxygen (O₂)

The oxygen gas (O₂) released during photosynthesis comes from which reactant?

• Carbon dioxide (CO₂)

• Carbohydrate

• Water (H₂O)

• Light energy

During the reduction of CO₂ to form carbohydrates, carbon atoms:

• Lose electrons

• Gain electrons

• Stay the same

• Are converted to oxygen

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In photosynthesis, the light energy absorbed by chlorophyll is used to:

• Produce heat

• Split CO₂

• Split water and release electrons

• Make oxygen directly

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In photosystem II (PSII), the main event that starts photosynthesis is:

• The splitting of CO₂

• Absorption of light energy by pigments

• Reduction of NADP⁺

• Fixation of carbon

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The absorption of light energy in PSII causes what to happen to electrons?

• They are destroyed

• They fall to a lower energy level

• They are excited to a higher energy state

• They combine with protons

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In PSII, what molecule carries the high-energy electron away from the reaction center?

• NADP⁺

• ATP

• PQ (plastoquinone)

• FADH₂

What is the main purpose of the electron transport chain (ETC) after PSII?

• To make NADPH directly

• To pump protons and help form ATP

• To fix CO₂ into sugar

• To absorb more light

The enzyme that produces ATP during photosynthesis is called:

• ATP lyase

• ATP synthase

• Rubisco

• Kinase

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Photosystem I (PSI) primarily functions to:

• Split water molecules

• Reduce NADP⁺ to NADPH

• Generate oxygen

• Fix carbon dioxide