Photosynthesis and Light Reactions Quiz
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Questions and Answers

What are the essential components used in photosynthesis to produce energy-storing sugars?

  • Light, O2, and organic matter
  • CO2, H2O, and organic matter
  • CO2, O2, and H2O
  • Light, CO2, and H2O (correct)

    • What is the waste product generated during photosynthesis?

  • Organic matter
  • Carbon dioxide
  • Water
  • Oxygen (correct)

    • What do autotrophs not need a supply of?

  • Light energy
  • Inorganic molecules
  • Organic carbon (correct)
  • Water

    • What do heterotrophs need in order to survive?

    <p>External organic molecules</p> Signup and view all the answers

    What ultimately produces the organic matter that animals 'feed' on?

    <p>Photoautotrophs</p> Signup and view all the answers

    What provides the bulk of the energy for the majority of the ecosystems on earth?

    <p>Photoautotrophs through photosynthesis</p> Signup and view all the answers

    Which process involves oxygen production and CO2 fixation?

    <p>Light-dependent photosynthesis</p> Signup and view all the answers

    What is the primary function of the Calvin cycle in photosynthesis?

    <p>Produce GA3P from CO2</p> Signup and view all the answers

    What provides the electrons for the reduction of CO2 to carbohydrate in photosynthesis?

    <p>Water</p> Signup and view all the answers

    Where is chlorophyll a present in organisms performing plant-type photosynthesis?

    <p>In all organisms performing plant-type photosynthesis</p> Signup and view all the answers

    What is the site of photosynthesis in plants?

    <p>Chloroplasts in mesophyll cells</p> Signup and view all the answers

    What is the major product of photosynthesis?

    <p>Sucrose and starch</p> Signup and view all the answers

    What is the primary function of the enzyme RuBisco in photosynthesis?

    <p>To catalyze the first reaction of the Calvin cycle</p> Signup and view all the answers

    What is the role of NADPH and ATP in photosynthesis?

    <p>To provide energy for the Calvin cycle to convert CO2 into a carbohydrate</p> Signup and view all the answers

    What is the function of starch in photosynthesis?

    <p>To store energy in the roots and underground storage organs</p> Signup and view all the answers

    What is the difference between the photosynthetic and respiratory electron transport chains (PS ETC and RS ETC)?

    <p>The source of energy is photons for the PS ETC and NADH/FADH2 for the RS ETC</p> Signup and view all the answers

    What is the product of the respiratory electron transport chain (RS ETC)?

    <p>Δ[H+]</p> Signup and view all the answers

    What is the function of sucrose in plants?

    <p>To serve as an energy transport molecule, moving from leaves to other parts of the plant</p> Signup and view all the answers

    What is the role of the light reactions in photosynthesis?

    <p>To capture the energy of light and produce ATP and NADPH</p> Signup and view all the answers

    What is the primary function of ATP synthase in the thylakoid membrane during light reactions?

    <p>Regenerate ATP using the electrochemical proton gradient</p> Signup and view all the answers

    What is the role of the oxygen-evolving complex (OEC) in Photosystem II (PSII)?

    <p>Catalyze the water-splitting reaction</p> Signup and view all the answers

    What is the function of the thylakoids in photosynthesis?

    <p>Contain chlorophyll and carotenoids for photon absorption and energy transfer</p> Signup and view all the answers

    What is the main product of the water-splitting reaction catalyzed by Photosystem II (PSII)?

    <p>Oxygen</p> Signup and view all the answers

    What is the function of Photosystem I (PSI) in the light reactions of photosynthesis?

    <p>Convert photon energy to energize NADPH, a high energy electron carrier</p> Signup and view all the answers

    What is the range of photosynthetically active radiation (PAR) in terms of wavelength?

    <p>400 – 700 nm</p> Signup and view all the answers

    What is the primary function of Rubisco in the Calvin cycle?

    <p>Rubisco catalyzes the first reaction of the Calvin cycle, converting CO2 into a carbohydrate.</p> Signup and view all the answers

    What is the role of sucrose in plants?

    <p>Sucrose is water-soluble and is used by plants as an energy transport molecule, capable of being moved from leaves to other parts of the plant.</p> Signup and view all the answers

    What is the difference between the photosynthetic and respiratory electron transport chains (PS ETC and RS ETC)?

    <p>The source of energy is photons for the PS ETC, and NADH/FADH2 for the RS ETC.</p> Signup and view all the answers

    What is the function of starch in photosynthesis?

    <p>Starch is also found in the roots and in underground storage organs (e.g. potato tubers) and is a form of energy storage in plants.</p> Signup and view all the answers

    What is the main product of the water-splitting reaction catalyzed by Photosystem II (PSII)?

    <p>The main product is oxygen, which is released as a byproduct.</p> Signup and view all the answers

    What is the primary function of the light reactions in photosynthesis?

    <p>The light reactions capture the energy of light (photons) and convert it into the energy of NADPH and ATP.</p> Signup and view all the answers

    What provides the bulk of the energy for the majority of the ecosystems on earth?

    <p>Photosynthesis provides the bulk of the energy for the majority of ecosystems on earth.</p> Signup and view all the answers

    What is the role of NADPH and ATP in photosynthesis?

    <p>NADPH and ATP produced in the light reactions are used in subsequent steps of the Calvin cycle to produce a 3C sugar.</p> Signup and view all the answers

    What is the site of photosynthesis in plants?

    <p>Photosynthesis occurs in the chloroplasts of plant cells, specifically in the stroma where carbon fixation (Calvin cycle) takes place.</p> Signup and view all the answers

    What is the role of the oxygen-evolving complex (OEC) in Photosystem II (PSII)?

    <p>The oxygen-evolving complex in PSII catalyzes the water-splitting reaction, releasing oxygen and providing electrons for the electron transport chain.</p> Signup and view all the answers

    Study Notes

    Photosynthesis and Light Reactions: Key Concepts

    • Photosynthetically active radiation (PAR) ranges from 400 – 700 nm, similar to the visible spectrum for humans
    • Photosynthetic pigments like chlorophyll and carotenoids absorb photons for photosynthesis
    • The absorption process involves a transition from the ground state to the excited state and subsequent energy transfer
    • Thylakoids contain chlorophyll and carotenoids and are the site of photon absorption and energy transfer
    • Photosystems organize pigments for light harvesting and funnel absorbed photons to reaction center chlorophyll
    • Photosystem II (PSII) contains an oxygen-evolving complex (OEC) that catalyzes the water-splitting reaction
    • The water-splitting reaction produces low energy electrons (LEEs), H+ ions, and oxygen
    • Photosystem I (PSI) converts photon energy to energize NADPH, a high energy electron carrier
    • ATP synthase in the thylakoid membrane regenerates ATP using the electrochemical proton gradient
    • The movement of proton gradient from lumen to stroma is essential for ATP regeneration
    • Light reactions convert photon energy into the chemical potential energy of ATP and NADPH
    • The Calvin cycle in the stroma uses ATP and NADPH to convert CO2 into 3C sugars

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    Description

    Test your knowledge of photosynthesis and light reactions with this quiz. Explore key concepts such as photosynthetically active radiation, absorption of photons by pigments, the role of thylakoids and photosystems, water-splitting reaction in Photosystem II, ATP and NADPH synthesis, and the Calvin cycle.

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