C1.3 Photosynthesis (Molecules): Practice Questions

• a.

  The rate of photosynthesis decreases because carbon dioxide is toxic.

• b.

  The rate of photosynthesis increases exponentially without ever leveling off.

• c.

  The rate of photosynthesis remains constant regardless of the concentration.

• d.

  The rate of photosynthesis increases up to a certain point and then levels off.

• a.

  They are all the same size but move at different speeds due to gravity.

• b.

  They have different solubilities in the solvent and different affinities for the paper.

• c.

  The pigments react with the paper to form new chemicals at different heights.

• d.

  They have different colors which repel each other.

• a.

  The action spectrum shows peaks in regions where chlorophyll a absorbs minimally, but chlorophyll b absorbs strongly.

• b.

  The action spectrum closely matches the absorption spectrum of chlorophyll a only.

• c.

  The action spectrum is consistently lower than the combined absorption spectrum of all pigments.

• d.

  The absorption spectrum of chlorophyll a and b show identical peaks.

• a.

  To provide electrons to replace those lost by Photosystem II.

• b.

  To provide the energy needed to pump protons into the thylakoid space.

• c.

  To fix carbon dioxide into organic molecules like glucose.

• d.

  To produce oxygen as a primary energy source for the Calvin cycle.

• a.

  To split and provide electrons, protons, and oxygen.

• b.

  To absorb light energy directly.

• c.

  To act as a final electron acceptor in the electron transport chain.

• d.

  To provide carbon atoms for glucose synthesis.

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.