Photosynthesis Overview
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Questions and Answers

Where does photosynthesis occur in plant cells?

  • In the chloroplasts (correct)
  • In the cell wall
  • In the mitochondria
  • In the nucleus
  • What is the energy source for the light-independent reactions?

  • CO2 and H2O
  • Glucose and other organic compounds
  • ATP and NADPH produced in light-dependent reactions (correct)
  • Light energy from the sun
  • What is the byproduct of photosynthesis that is released into the atmosphere?

  • Glucose
  • CO2
  • Oxygen (correct)
  • Water
  • What is the purpose of the regeneration of RuBP in the Calvin Cycle?

    <p>To regenerate the five-carbon sugar that binds CO2</p> Signup and view all the answers

    What is the role of photosynthesis in regulating Earth's climate?

    <p>It helps regulate the Earth's climate</p> Signup and view all the answers

    Study Notes

    Photosynthesis Overview

    • Definition: Process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of organic compounds
    • Occurs in specialized organelles called chloroplasts, found in plant cells

    Light-Dependent Reactions

    • Light absorption by pigments such as chlorophyll and other accessory pigments
    • Excitation of electrons, which are then transferred to electron acceptors
    • Formation of high-energy molecules ATP and NADPH

    Light-Independent Reactions (Calvin Cycle)

    • Fixation of CO2 into organic compounds using ATP and NADPH produced in light-dependent reactions
    • Regeneration of RuBP, the five-carbon sugar that binds CO2
    • Production of glucose and other organic compounds

    Equation

    6 CO2 + 6 H2O + light energy → C6H12O6 (glucose) + 6 O2

    Factors Affecting Photosynthesis

    • Light intensity and quality
    • Temperature
    • Water availability
    • CO2 concentration
    • pH

    Importance of Photosynthesis

    • Produces oxygen for the atmosphere
    • Supports food chains and webs
    • Provides energy and organic compounds for heterotrophic organisms
    • Helps regulate Earth's climate

    Photosynthesis Overview

    • Photosynthesis is the process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of organic compounds.
    • This process occurs in specialized organelles called chloroplasts, found in plant cells.

    Light-Dependent Reactions

    • Light absorption occurs through pigments such as chlorophyll and other accessory pigments.
    • Excitation of electrons takes place, which are then transferred to electron acceptors.
    • High-energy molecules ATP and NADPH are formed.

    Light-Independent Reactions (Calvin Cycle)

    • CO2 is fixed into organic compounds using ATP and NADPH produced in light-dependent reactions.
    • RuBP, a five-carbon sugar, is regenerated and binds CO2.
    • Glucose and other organic compounds are produced.

    Equation for Photosynthesis

    • 6 CO2, 6 H2O, and light energy react to form C6H12O6 (glucose) and 6 O2.

    Factors Affecting Photosynthesis

    • Light intensity and quality impact photosynthesis.
    • Temperature affects the rate of photosynthesis.
    • Water availability influences photosynthesis.
    • CO2 concentration affects photosynthesis.
    • pH level affects photosynthesis.

    Importance of Photosynthesis

    • Oxygen is produced for the atmosphere through photosynthesis.
    • Photosynthesis supports food chains and webs.
    • It provides energy and organic compounds for heterotrophic organisms.
    • Photosynthesis helps regulate Earth's climate.

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    Description

    Learn about the process of photosynthesis, where plants and some microorganisms convert light energy into chemical energy, and the light-dependent reactions that occur in chloroplasts.

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