Photosynthesis: Energy Transfer Process
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Questions and Answers

What is the primary function of photosynthesis?

  • To release energy for work in respiration
  • To produce ATP molecules for energy
  • To provide energy for chemoautotrophs
  • To convert light energy to chemical potential energy in organic molecules (correct)
  • Which organisms are known as photoautotrophs?

  • Single-celled protoctists and red algae
  • Nitrifying bacteria
  • Brown algae and chemoautotrophs
  • Green plants and photosynthetic prokaryotes (correct)
  • What is the primary source of hydrogen used in photosynthesis?

  • Starch
  • Water (correct)
  • ATP molecules
  • Carbon dioxide
  • Which organisms do not depend on light energy and use chemical energy sources for photosynthesis?

    <p>Nitrifying bacteria</p> Signup and view all the answers

    What is the overall equation for photosynthesis in green plants?

    <p>$6CO_2 + 6H_2O + light ightarrow C_6H_{12}O_6 + 6O_2$</p> Signup and view all the answers

    What is the main product commonly formed in photosynthesis?

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

    Which type of reaction in photosynthesis requires light energy?

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

    What is the main purpose of the light-dependent reactions in photosynthesis?

    <p>To convert light energy into ATP</p> Signup and view all the answers

    Which pigment is responsible for the green color of plants?

    <p>Chlorophyll a</p> Signup and view all the answers

    What do carotenoids mainly absorb in the spectrum of light?

    <p>Red and blue-violet regions</p> Signup and view all the answers

    What does an absorption spectrum graph represent for a pigment?

    <p>Absorbance of different wavelengths of light by the pigment</p> Signup and view all the answers

    How does the action spectrum relate to the absorption spectrum in photosynthesis?

    <p>The absorption spectrum closely coincides with the action spectrum</p> Signup and view all the answers

    What happens when the absorbed light energy excites electrons in the pigment molecules during photosynthesis?

    <p>The pigment releases excess energy as heat and light before returning to ground state</p> Signup and view all the answers

    How does the absorption spectrum graph differ from the action spectrum graph?

    <p>Absorption spectrum shows absorbance, while action spectrum shows rate of photosynthesis.</p> Signup and view all the answers

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