Photosynthesis and Respiration
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Questions and Answers

Where does the O2 produced by photosynthesis come from?

  • Chloroplasts
  • Mesophyll cells
  • CO2
  • H2O (correct)

    • Which pigment plays a central role in converting solar energy into chemical energy during photosynthesis?

  • Carotene
  • Phycobilins
  • Xanthophyll
  • Chlorophyll (correct)

    • In which cells are chloroplasts concentrated in a plant leaf?

  • Vein cells
  • Mesophyll cells (correct)
  • Stomatal cells
  • Epidermal cells

    • What is the primary function of stomata in a plant leaf?

    <p>Allow CO2 to enter and O2 to exit</p> Signup and view all the answers

    Which process occurs in chloroplasts and converts light energy into chemical energy?

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

    What was the misconception regarding the source of O2 in photosynthesis before research using 18O?

    <p>O2 came from CO2</p> Signup and view all the answers

    What is the main difference between autotrophs and heterotrophs?

    <p>Autotrophs produce organic molecules from inorganic sources, while heterotrophs obtain organic material from other organisms.</p> Signup and view all the answers

    Which process directly contributes to the availability of atmospheric oxygen?

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

    Why do almost all heterotrophs, including humans, depend on photoautotrophs for food?

    <p>Heterotrophs cannot produce their own food through photosynthesis like autotrophs.</p> Signup and view all the answers

    How does photosynthesis contribute to the living world beyond just feeding plants?

    <p>Photosynthesis produces O2 that supports other metabolic processes.</p> Signup and view all the answers

    In which organisms does the process of photosynthesis occur?

    <p>Plants, algae, some prokaryotes, and certain other unicellular eukaryotes</p> Signup and view all the answers

    How did scientists use isotopes to determine the source of the oxygen produced during photosynthesis?

    <p>By tracking the movement of oxygen isotopes in water and carbon dioxide during photosynthesis.</p> Signup and view all the answers

    Which process is an essential process not only for plants but for all life forms of the biosphere?

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

    During photosynthesis, what is reduced to sugar?

    <p>CO2</p> Signup and view all the answers

    What is the overall chemical change during cellular respiration?

    <p>Sugar is oxidized, and O2 is reduced to form H2O</p> Signup and view all the answers

    Where does cellular respiration take place in eukaryotic cells?

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

    Which of the following statements is true about the energy sources for life?

    <p>Photosynthesis captures energy from the sun for life processes</p> Signup and view all the answers

    What process captures some of the released energy to make ATP in cells?

    <p>Cellular respiration</p> Signup and view all the answers

    Which pigment absorbs mainly blue-violet and red light?

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

    What is the role of carotenoids in photosynthesis?

    <p>Broaden the spectrum used for photosynthesis</p> Signup and view all the answers

    Which process converts light energy into chemical energy?

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

    Where are ATP and NADPH produced in photosynthesis?

    <p>Thylakoid membrane facing the stroma</p> Signup and view all the answers

    What is the importance of carotenoids in photosynthesis?

    <p>Absorb and dissipate excessive light energy</p> Signup and view all the answers

    What property of a chloroplast integrates the two stages of photosynthesis?

    <p>Structural organization</p> Signup and view all the answers

    Where are chlorophyll molecules built into in a chloroplast?

    <p>Thylakoid membrane</p> Signup and view all the answers

    Which part of photosynthesis involves the conversion of solar energy into chemical energy?

    <p>Light Reactions</p> Signup and view all the answers

    What is the by-product of the water-splitting process in the Light Reactions of photosynthesis?

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

    Where does the Calvin Cycle take place within a chloroplast?

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

    What is the main function of ATP in photosynthesis?

    <p>Converting solar energy to chemical energy</p> Signup and view all the answers

    In photosynthesis, what provides a source of electrons and protons as well as gives off oxygen as a by-product?

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

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