C3 Carbon Fixation Pathway Quiz Questions & Answers

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C3 Carbon Fixation Pathway Quiz Questions & Answers - Quiz

Welcome to the "C3 Carbon Fixation Pathway" quiz! The C3 carbon fixation pathway is one of the primary processes involved in photosynthesis. This quiz will test your knowledge about the C3 pathway, its characteristics, and its role in plant metabolism.

The quiz consists of questions covering various aspects of the C3 carbon fixation pathway. From understanding the definition and enzyme involved in carbon fixation to exploring the disadvantages, plant families, and cellular locations of the pathway, you will delve into the intricacies of C3 plants.

By taking this quiz, you will enhance your understanding of the C3 carbon fixation pathway and Read moreits significance in plant biology. Test your knowledge and discover how C3 plants capture and utilize carbon dioxide to produce essential organic molecules. Good luck!


Questions and Answers
  • 1. 

    What is the C3 carbon fixation pathway?

    • A.

      A pathway involved in glycolysis

    • B.

      A pathway in protein synthesis

    • C.

      A metabolic pathway in photosynthesis

    • D.

      A process in cellular respiration

    Correct Answer
    C. A metabolic pathway in photosynthesis
    Explanation
    The C3 carbon fixation pathway is a metabolic pathway in photosynthesis. It's the initial step in the process of converting carbon dioxide (CO2) into glucose and other organic molecules in plants. During this pathway, a three-carbon compound, 3-phosphoglycerate (3-PGA), is formed.

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  • 2. 

    Which enzyme is responsible for carbon fixation in C3 plants?

    • A.

      Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco)

    • B.

      Phosphoenolpyruvate carboxylase

    • C.

      Pyruvate dehydrogenase

    • D.

      Sucrose synthase

    Correct Answer
    A. Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco)
    Explanation
    The enzyme responsible for carbon fixation in C3 plants is Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase). It catalyzes the reaction where carbon dioxide from the atmosphere is incorporated into organic molecules during photosynthesis.

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  • 3. 

    Which plant family includes several examples of C3 plants?

    • A.

      Rosaceae

    • B.

      Poaceae

    • C.

      Orchidaceae

    • D.

      Solanaceae

    Correct Answer
    B. Poaceae
    Explanation
    The Poaceae family, commonly known as grasses, includes several examples of C3 plants. These plants use the C3 photosynthetic pathway as their primary method for carbon fixation.

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  • 4. 

    Where does the initial carbon fixation occur in C3 plants?

    • A.

      Mesophyll cells

    • B.

      Bundle-sheath cells

    • C.

      Guard cells

    • D.

      Xylem cells

    Correct Answer
    A. Mesophyll cells
    Explanation
    In C3 plants, the initial carbon fixation occurs in mesophyll cells. These cells contain the chloroplasts where photosynthesis takes place, and Rubisco is present in the chloroplasts of mesophyll cells.

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  • 5. 

    What is the primary disadvantage of the C3 carbon fixation pathway?

    • A.

      High photorespiration rates

    • B.

      Limited water availability

    • C.

      Inefficient carbon dioxide fixation

    • D.

      Slow growth rate

    Correct Answer
    C. Inefficient carbon dioxide fixation
    Explanation
    The primary disadvantage of the C3 carbon fixation pathway is its inefficiency in fixing carbon dioxide, particularly when carbon dioxide levels are low. This inefficiency leads to higher rates of photorespiration, which can limit overall photosynthetic efficiency.

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  • 6. 

    What is the name of the three-carbon molecule produced during carbon fixation in C3 plants?

    • A.

      3-Phosphoglycerate

    • B.

      Ribulose-1,5-bisphosphate

    • C.

      Oxaloacetate

    • D.

      Fructose-1,6-bisphosphate

    Correct Answer
    A. 3-Phosphoglycerate
    Explanation
    The three-carbon molecule produced during carbon fixation in C3 plants is called 3-phosphoglycerate (3-PGA). It is an intermediate compound in the Calvin cycle, where carbon dioxide is converted into sugars.

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  • 7. 

    Which environmental factor can negatively impact the efficiency of the C3 pathway?

    • A.

      High temperatures

    • B.

      Low light intensity

    • C.

      High humidity

    • D.

      Low carbon dioxide levels

    Correct Answer
    D. Low carbon dioxide levels
    Explanation
    Low carbon dioxide levels can negatively impact the efficiency of the C3 pathway. When carbon dioxide levels are low, Rubisco can mistakenly bind with oxygen instead of carbon dioxide, leading to increased photorespiration and decreased photosynthetic efficiency.

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  • 8. 

    What is the primary function of mesophyll cells in C3 plants?

    • A.

      Carbon dioxide fixation

    • B.

      Water absorption

    • C.

      Stomatal regulation

    • D.

      Nutrient storage

    Correct Answer
    A. Carbon dioxide fixation
    Explanation
    The primary function of mesophyll cells in C3 plants is carbon dioxide fixation. These cells contain the chloroplasts where the initial steps of photosynthesis occur, including the capture of carbon dioxide and its conversion into organic compounds.

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  • 9. 

    Which photosynthetic pathway is most common in C3 plants?

    • A.

      C4 photosynthesis

    • B.

      CAM photosynthesis

    • C.

      Calvin cycle

    • D.

      Photorespiration

    Correct Answer
    C. Calvin cycle
    Explanation
    The most common photosynthetic pathway in C3 plants is the Calvin cycle, which is the central part of the C3 carbon fixation process. It involves the conversion of carbon dioxide into sugars and other organic molecules.

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  • 10. 

    Where does the C3 carbon fixation pathway occur in plant cells?

    • A.

      Chloroplasts

    • B.

      Nucleus

    • C.

      Mitochondria

    • D.

      Golgi apparatus

    Correct Answer
    A. Chloroplasts
    Explanation
    The C3 carbon fixation pathway occurs within the chloroplasts of plant cells. Chloroplasts are the organelles responsible for photosynthesis, and they contain the enzymes and pigments necessary for the C3 pathway to function.

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  • Current Version
  • Sep 12, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 13, 2023
    Quiz Created by
    Amit Mangal

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