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.

Tags

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.

Tags

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)

Tags

NGSS.HS-LS2-5

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

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

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

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

Tags

NGSS.HS-LS2-5

NGSS.HS-LS2-6

NGSS.HS-LS4-5