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General Biology Photosynthesis

20 Questions
Biology Quizzes & Trivia

Intro to photosynthesis

Questions and Answers
  • 1. 
    Which of these types of organisms produce the biosphere's food supply?
    • A. 

      Consumers

    • B. 

      Autotrophs

    • C. 

      Heterotrophs

  • 2. 
    How does carbon dioxide enter the leaf?
    • A. 

      Through the vascular system

    • B. 

      Through the chloroplasts

    • C. 

      Through the stomata

  • 3. 
    Cellular respiration and photosynthesis are similar in that both involve _____.
    • A. 

      The release of O2 into the atmosphere

    • B. 

      Redox reactions

    • C. 

      The production of sugars

  • 4. 
    The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from _____.
    • A. 

      Light

    • B. 

      Water

    • C. 

      Carbon dioxide

    • D. 

      Glucose

  • 5. 
    The wavelengths of light absorbed by pigments in the granum are mainly in which range?
    • A. 

      Green, which is why plants are green

    • B. 

      Blue-violet and red-orange

    • C. 

      The range absorbed by carotenoids

  • 6. 
    Which one of the following colors is most strongly reflected by chlorophyll?
    • A. 

      Red

    • B. 

      Orange

    • C. 

      Blue

    • D. 

      Green

    • E. 

      Yellow

  • 7. 
    When chloroplast pigments absorb light, _____.
    • A. 

      They gain electrons

    • B. 

      They lose energy

    • C. 

      Their electrons become excited

    • D. 

      Their protons become exictied

  • 8. 
    The light reactions of photosynthesis generate high-energy electrons, which end up in _____. The light reactions also produce _____ and _____.
    • A. 

      ATP ... NADPH ... oxygen

    • B. 

      Oxygen ... sugar ... ATP

    • C. 

      Chlorophyll ... ATP ... NADPH

    • D. 

      NADPH ... ATP ... oxygen

  • 9. 
    During photosynthesis in chloroplasts, O2 is produced from _____ via a series of reactions associated with _____.
    • A. 

      H2O ... NADPH-producing photosystem

    • B. 

      H2O ... the water-splitting photosystem

    • C. 

      CO2 ... both the NADPH-producing photosystem

    • D. 

      CO2 ... Calvin cycle

  • 10. 
    The _____ of photosynthesis performs a task similar to that of the _____ of cellular respiration.
    • A. 

      NADP+ ... NADH

    • B. 

      Calvin cycle ... electron transport

    • C. 

      NADPH ... NADH

  • 11. 
    Both mitochondria and chloroplasts _____.
    • A. 

      Obtain electrons from water

    • B. 

      Reduce NAD+, forming NADP

    • C. 

      Are surrounded by a single membrane

    • D. 

      Use an H+ gradient to produce ATP

  • 12. 
    In photosynthesis, what is the fate of the oxygen atoms present in CO2? They end up _____
    • A. 

      In sugar molecules

    • B. 

      As molecular oxygen and in sugar molecules

    • C. 

      In sugar molecules and in water

  • 13. 
    In an experiment, a plant was given _____ containing radioactive 18O, and the radioactive oxygen atoms were used to make sugar.
    • A. 

      Water

    • B. 

      Carbon dioxide

    • C. 

      Oxygen gas

  • 14. 
    In photosynthesis, plants use carbon from _____ to make sugar and other organic molecules
    • A. 

      Carbon dioxide

    • B. 

      The sun

    • C. 

      Water

  • 15. 
    What effect does photosynthesis have on the greenhouse effect?
    • A. 

      It reduces atmospheric carbon dioxide and thus reduces greenhouse warming.

    • B. 

      It increases atmospheric carbon dioxide and thus increases the greenhouse effect.

    • C. 

      It increases atmospheric carbon dioxide and thus reduces the greenhouse effect.

    • D. 

      It has no impact on the greenhouse effect.

    • E. 

      It reduces atmospheric carbon dioxide and thus increases greenhouse warming.

  • 16. 
    Carbon dioxide makes up about _____ of the air we breathe
    • A. 

      0.03%

    • B. 

      0.30%

    • C. 

      3.00%

  • 17. 
    Why is NADP+ needed in photosynthesis?
    • A. 

      It helps produce ATP from the light reactions.

    • B. 

      It absorbs light energy.

    • C. 

      It forms part of the water-splitting photosystem.

    • D. 

      It is the primary electron acceptor.

    • E. 

      It forms NADPH to be used in the Calvin cycle.

  • 18. 
    The Calvin cycle is a series of reactions that _____.
    • A. 

      Produce oxygen gas

    • B. 

      Convert light energy to chemical energy

    • C. 

      Produce NADPH

    • D. 

      Assemble sugar molecules by incorporating carbon

    • E. 

      All of the above

  • 19. 
    The "photo-" part of the word "photosynthesis" refers to _____, whereas "-synthesis" refers to _____.
    • A. 

      The reactions in the stomata ... the reactions in the thylakoid

    • B. 

      He Calvin cycle ... the incorporation of carbon dioxide

    • C. 

      The light reactions that occur in the thylakoids ... the incorporation of carbon dioxide

    • D. 

      The light reactions ... reactions in the thylakoids

  • 20. 
    • A. 

      Stroma

    • B. 

      Thylakoid membrane

    • C. 

      Nucleus

    • D. 

      Stomata