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Photosynthesis must provide a source of electrons and H+because ____.


A) atmospheric CO2 must be oxidized by adding electrons
B) CO2must be reduced to produce sugars
C) hydrogen atoms are added to oxygen to form water
D) hydrogen ions and electrons react to produce hydrogen gas
E) hydrogen ions and electrons are converted into oxygen gas

F) B) and C)
G) A) and E)

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The loss of O2in the atmosphere 600-800 million years ago was likely due to the "fossilization" of organic matter trapped in Earth's crust.

A) True
B) False

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Chloroplasts kept in the dark can continue to make sugar if provided with ____.


A) NADPH, ATP, and CO2
B) NADPH and ATP
C) CO2and ATP
D) NADPH, CO2, and ADP
E) water and ATP

F) B) and C)
G) C) and D)

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