Photosynthesis: Light-Dependent Reactions
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Questions and Answers

What is the primary function of the granum in chloroplasts?

  • Trap sunlight to energize the food-making process (correct)
  • Convert water into sugar for plant food
  • Absorb carbon dioxide from the air
  • Produce green pigment for photosynthesis
  • Which part of the chloroplast is responsible for converting carbon dioxide into sugar?

  • Stroma (correct)
  • Chlorophyll
  • Roots
  • Granum
  • What role does sunlight play in photosynthesis?

  • Provides energy for the food-making process (correct)
  • Absorbs carbon dioxide from the air
  • Converts sugar into energy for plants
  • Acts as a source of chlorophyll production
  • If a plant lacks chlorophyll, what is the most likely consequence?

    <p>Inability to trap sunlight for photosynthesis</p> Signup and view all the answers

    Where do plants absorb water from for photosynthesis?

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

    How does chloroplast convert sunlight into plant power?

    <p>By absorbing specific wavelengths of sunlight with chlorophyll</p> Signup and view all the answers

    Which part of the leaf absorbs carbon dioxide during photosynthesis?

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

    What is the main purpose of the Light-Dependent Reaction in photosynthesis?

    <p>Generate ATP energy molecules</p> Signup and view all the answers

    What is the role of xylem in plants' internal highway system?

    <p>Absorb water and minerals from roots to transport to leaves</p> Signup and view all the answers

    During photosynthesis, what is the primary function of the Calvin Cycle?

    <p>Use energy from ATP to fix carbon dioxide into glucose</p> Signup and view all the answers

    In testing a leaf for starch, what does a blue-black color change indicate?

    <p>Presence of starch</p> Signup and view all the answers

    What is the major by-product of photosynthesis that is released into the atmosphere?

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

    Study Notes

    Photosynthesis: Powering Life on Earth

    • Plants create their own food through photosynthesis, using sunlight, water, and air.
    • Chloroplasts, tiny green factories inside plant cells, are responsible for photosynthesis.

    The Photosynthesis Powerhouse: Chloroplasts

    • Chloroplasts have two key parts:
      • Granum: stacked sacs containing chlorophyll (green pigment) that trap sunlight to energize food production.
      • Stroma: colorless gel where energy from sunlight is used to convert CO2 into sugar (food for plants).

    Sunlight: The Fuel

    • Sunlight provides energy for photosynthesis through chlorophyll.
    • Chlorophyll absorbs specific wavelengths of sunlight, converting it into plant energy.

    Ingredients for Plant Food

    • Plants use simple ingredients:
      • Water: absorbed from the soil through roots.
      • Carbon dioxide: taken in from the air through stomata on leaves.

    Mechanisms of Photosynthesis

    • Photosynthesis has two stages:
      • Light-Dependent Reaction (Light Reaction): occurs in granum, where chlorophyll absorbs sunlight, releasing electrons and producing ATP.
      • Calvin Cycle (Carbon-Fixing Factory): uses energy from ATP to fix CO2 into organic molecules like glucose (plant food).

    Testing for Starch

    • Iodine solution can be used to detect starch in leaves, bread, or potatoes.
    • A blue-black color indicates the presence of starch.

    Importance of Photosynthesis

    • Photosynthesis has a domino effect on life on Earth:
      • Food source for all living things, directly or indirectly.
      • Releases oxygen as a by-product, essential for animal respiration.
      • Helps regulate Earth's temperature by absorbing CO2 during photosynthesis.

    Plant Highway System

    • Plants have an internal transportation system:
      • Xylem: transports water and minerals from roots to leaves.
      • Phloem: transports food produced in leaves to other plant parts like roots, stems, fruits, and flowers.

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    Description

    Learn about the light-dependent reactions of photosynthesis, where sunlight is converted into energy for the production of ATP. Understand the role of chlorophyll and the mechanisms involved in this crucial step of photosynthesis.

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