Quiz #2: Photosynthesis (Topic 5)

Read the statements below regarding photosystems. Which statement does not accurately describe their functions? (3.5)

• Both photosystem I and photosystem II contain pigment molecules that capture light.

• Inside the reaction center, electrons are excited by solar energy and then pass to electron acceptor molecules.

• Photosystem I is closely associated with molecules that aid in the splitting of water.

• The flow of electrons goes from photosystem II to photosystem I.

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NGSS.HS-LS1-5

Which of the following represents both a product of the light reactions and a reactant in the Calvin cycle? (3.5)

• NADP⁺

• Both ATP and NADPH

• ADP + Pi

• NADPH

• ATP

In plants, which pigment plays a central role in this process of photoprotection?

• Chlorophyll a

• Chlorophyll b

• Carotenoids

• Flavonoids

Which statement best explains how the electron transport chain (ETC) functions in the light-dependent reactions of photosynthesis?

• The ETC transports electrons to the Calvin cycle to power sugar synthesis.

• The ETC uses the energy from excited electrons to pump protons across the thylakoid membrane, creating a proton gradient.

• The ETC is responsible for splitting water molecules to release oxygen.

• The ETC transfers electrons directly to ATP synthase, facilitating ATP production.

Why is chlorophyll a critical pigment in the light-dependent reactions of photosynthesis?

• It directly captures carbon dioxide for the Calvin cycle.

• It absorbs light energy and transfers excited electrons to the electron transport chain.

• It is responsible for the synthesis of ATP from ADP and inorganic phosphate.

• It acts as the primary electron donor in the Calvin cycle.

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NGSS.HS-LS1-5

Which of the following best describes the role of the proton gradient in photosynthesis?

• It drives the splitting of water molecules in Photosystem II.

• It powers the synthesis of ATP via ATP synthase as protons flow back across the thylakoid membrane.

• It facilitates the transfer of electrons from Photosystem II to Photosystem I.

• It is responsible for reducing NADP+ to NADPH in the stroma.

Identify the primary function of the Calvin Cycle in photosynthesis. (1 pt)

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NGSS.HS-LS2-5

Describe the role of Rubisco in photosynthesis and explain why its interaction with oxygen is considered wasteful. (1 pt)

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Explain how the introduction of carboxysome into C3 plants could enhance photosynthesis efficiency. (1 pt)

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NGSS.HS-LS2-5

Discuss one potential environmental or ecological impact of introducing genetically engineered carboxysomes into crop plants. (1 pt)

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NGSS.HS-LS2-6

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