9. Photosynthesis
Light Reactions of Photosynthesis
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Practice this topic
- Multiple Choice
Describe the primary function of the light reactions of photosynthesis.
a) Production of NADPH used in cellular respiration.
b) Use of ATP to make glucose.
c) Conversion of chemical energy to light energy.
d) Production of ATP and NADPH.
- Multiple Choice
Where do the electrons that are excited in photosystem II come from?
a) CO2.
b) O2.
c) Glucose.
d) Photosystem I.
e) Water.
- Multiple Choice
During the light reactions, photosystem I functions to_________, and photosystem II functions to __________.
a) Reduce CO2; oxidize NADPH.
b) Synthesize ATP; Produce O2.
c) Produce O2; oxidize NADPH.
d) Reduce NADP+; oxidize H2O.
- Multiple Choice
What is the correct order of steps of the light reactions of Photosynthesis?
a) photosystem I, ETC, photosystem II, NADP+ reduction, chemiosmosis.
b) photosystem I, photosystem II, ETC, NADP+ reduction, chemiosmosis.
c) photosystem II, ETC, photosystem I, NADP+ reduction, chemiosmosis.
d) photosystem II, photosystem I, ETC, NADP+ reduction, chemiosmosis.
- Open QuestionAdd labels to the figure that follows, which illustrates the product and reactants of photosynthesis and the relationship between its light reactions and light-independent reactions.
- Open QuestionWhich of the following sequences correctly represents the flow of electrons during photosynthesis?a. NADPH→O2→CO2b. H2O→NADPH→Calvincyclec. H2O→photosystemI→photosystemII d. NADPH→electrontransportchain→O2
- Open QuestionWhen light strikes chlorophyll molecules in the reaction-center complex, they lose electrons, which are ultimately replaced bya. splitting water.b. oxidizing NADPH.c. the primary electron acceptor.d. the electron transport chain.
- Open QuestionWhich of the following does not occur during the light reactions of photosynthesis?a. Water is released;b. Electrons from chlorophyll are moved to a higher-energy state by light;c. ATP is produced;d. NADPH is produced to carry electrons to the light-independent reactions;e. Oxygen is produced when water is split.