Honors Biology: Photosynthesis Quiz!

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Honors Biology: Photosynthesis Quiz! - Quiz

Let’s take a look at one of the most fundamental topics in all of the scientific study of biology – photosynthesis! This is how a plant utilizes energy from the sun, as well as water from the roots and carbon dioxide from the air, to produce its own food


Questions and Answers
  • 1. 

    Which of the following is a product of the Calvin cycle?

    • A.

      Carbon dioxide

    • B.

      NADP+

    • C.

      Oxygen

    • D.

      FADH2

    Correct Answer
    B. NADP+
    Explanation
    NADP+ is a product of the Calvin cycle. The Calvin cycle is a series of reactions that occur in the stroma of chloroplasts during photosynthesis. It is responsible for converting carbon dioxide into glucose. NADP+ is an electron carrier molecule that accepts electrons and hydrogen ions during the light-dependent reactions of photosynthesis. These electrons and hydrogen ions are then used in the Calvin cycle to convert carbon dioxide into glucose. Therefore, NADP+ is a product of the Calvin cycle.

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  • 2. 

    In which of the following structures do the light-independent reactions take place?

    • A.

      Nucleus

    • B.

      Matrix

    • C.

      Thylakoids

    • D.

      Stroma

    • E.

      Cristae

    Correct Answer
    D. Stroma
    Explanation
    The light-independent reactions, also known as the Calvin cycle, take place in the stroma of the chloroplasts. The stroma is the fluid-filled space surrounding the thylakoids, where the light-dependent reactions occur. In the light-independent reactions, carbon dioxide is converted into glucose using the energy from ATP and NADPH produced in the light-dependent reactions. The stroma provides the necessary enzymes and other molecules required for this process to occur. Therefore, the correct answer is stroma.

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  • 3. 

    Photosystems are functional pigment groups located on the:

    • A.

      Proteins of the plasma membrane

    • B.

      Membranes of the thylakoids

    • C.

      In the stroma of the chloroplasts

    • D.

      In the fluids of vacuoles

    Correct Answer
    B. Membranes of the thylakoids
    Explanation
    Photosystems are functional pigment groups that are responsible for capturing light energy during photosynthesis. They are located on the membranes of the thylakoids, which are flattened sacs found within the chloroplasts. The thylakoid membranes contain the necessary pigments, such as chlorophyll, to absorb light and convert it into chemical energy. This energy is then used to drive the synthesis of ATP and the production of NADPH, which are essential for the light-dependent reactions of photosynthesis. Therefore, the correct answer is "membranes of the thylakoids".

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  • 4. 

    RuBP...

    • A.

      Begins the Calvin cycle

    • B.

      Functions as an enzyme

    • C.

      Breaks into two equal parts

    • D.

      Is a 6-carbon sugar

    Correct Answer
    A. Begins the Calvin cycle
    Explanation
    Remember, RuBP must join with a CO2 before it can break into two equal parts.

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  • 5. 

    During photorespiration, Oxygen binds to

    • A.

      Phosphoglyxerate

    • B.

      RuBP

    • C.

      Malate

    • D.

      Carbon Dioxide

    Correct Answer
    B. RuBP
    Explanation
    During photorespiration, oxygen binds to RuBP (ribulose-1,5-bisphosphate). This process occurs when the concentration of carbon dioxide is low and oxygen levels are high. Oxygen competes with carbon dioxide for the active site of the enzyme RuBisCO, resulting in the binding of oxygen to RuBP instead of carbon dioxide. This leads to the formation of a two-carbon compound called phosphoglycolate, which is then converted into glycolate and further metabolized in the peroxisomes and mitochondria. This process is energetically costly and reduces the efficiency of photosynthesis.

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  • 6. 

    In the light-dependent reactions:

    • A.

      Carbon dioxide is fixed

    • B.

      ATP and NADPH form

    • C.

      Carbon dioxide accepts electrons

    • D.

      Sugar phosphates form

    Correct Answer
    B. ATP and NADPH form
    Explanation
    In the light-dependent reactions of photosynthesis, ATP and NADPH form. This is because during this phase, light energy is absorbed by chlorophyll molecules in the thylakoid membranes of the chloroplasts. This energy is then used to generate ATP through a process called photophosphorylation, where ADP is phosphorylated to form ATP. Additionally, NADP+ molecules are reduced to form NADPH, which serves as a carrier of high-energy electrons. These ATP and NADPH molecules are subsequently used in the light-independent reactions (Calvin cycle) to fix carbon dioxide and produce sugar phosphates.

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  • 7. 

    The green pigment in plants that is capable of absorbing the sun's energy is:

    • A.

      Porphyrin

    • B.

      Beta carotene

    • C.

      Chlorophyll

    • D.

      Thylakoid

    • E.

      RuBP

    Correct Answer
    C. Chlorophyll
    Explanation
    Chlorophyll is the green pigment found in plants that is responsible for absorbing sunlight during photosynthesis. It is located in the chloroplasts of plant cells and plays a vital role in converting light energy into chemical energy, which is used to produce glucose and oxygen. Without chlorophyll, plants would not be able to carry out photosynthesis and produce their own food.

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  • 8. 

    The light-dependent reactions of photosynthesis:

    • A.

      Do not always require light energy

    • B.

      Are associated with the thylakoids of the chloroplasts

    • C.

      Take place in the stroma of the chloroplasts

    • D.

      Use ATP to produce glucose

    • E.

      Require a source of carbon dioxide

    Correct Answer
    B. Are associated with the thylakoids of the chloroplasts
    Explanation
    The light-dependent reactions of photosynthesis are associated with the thylakoids of the chloroplasts. This is because the thylakoids contain the pigments, such as chlorophyll, that absorb light energy. During the light-dependent reactions, these pigments capture light energy and convert it into chemical energy in the form of ATP and NADPH. This energy is then used in the subsequent reactions of photosynthesis to produce glucose. Therefore, the thylakoids play a crucial role in capturing and converting light energy into chemical energy.

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  • 9. 

    In the photosynthetic reaction center:

    • A.

      Water is split

    • B.

      Carbon dioxide is fixed

    • C.

      ATP is produced

    • D.

      Electrons are energized

    • E.

      All of these

    Correct Answer
    D. Electrons are energized
    Explanation
    Yes, water is split in the photosystem, but not in the reaction center!

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  • 10. 

    The oxygen released during photosynthesis comes from the:

    • A.

      Splitting of water molecules

    • B.

      Splitting of carbon dioxide molecules

    • C.

      Formation of ATP

    • D.

      Formation of glucose

    • E.

      Combination of oxygen atoms and high-energy electrons

    Correct Answer
    A. Splitting of water molecules
    Explanation
    During photosynthesis, plants use sunlight to convert carbon dioxide and water into glucose and oxygen. The oxygen released in this process comes from the splitting of water molecules. Through a series of complex reactions, the energy from sunlight is used to break down water molecules into oxygen, hydrogen ions, and electrons. The oxygen is then released as a byproduct, while the hydrogen ions and electrons are used in the formation of glucose. Therefore, the correct answer is the splitting of water molecules.

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  • 11. 

    In noncyclic electron flow, electrons that leave the chlorophyll:

    • A.

      Return to the chlorophyll

    • B.

      Are used to turn NADP+ into NADPH

    • C.

      Produce only ATP

    • D.

      Are channeled to the light-independent reactions by carbon dioxide

    • E.

      Are used to split water molecules

    Correct Answer
    B. Are used to turn NADP+ into NADPH
    Explanation
    Noncyclic means non-cycle

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  • 12. 

    In the light-independent reactions:

    • A.

      Carbon dioxide is fixed in organic molecules

    • B.

      Energy in the form of ATP is used

    • C.

      NADPH is required

    • D.

      Glucose is formed

    • E.

      All of these

    Correct Answer
    E. All of these
    Explanation
    In the light-independent reactions, all of the mentioned processes occur. Carbon dioxide is fixed in organic molecules, meaning it is converted into a usable form for the plant. Energy in the form of ATP is used to power the reactions and NADPH is required as a reducing agent. Ultimately, these reactions lead to the formation of glucose, which is an important energy source for the plant. Therefore, all of these processes occur in the light-independent reactions.

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  • 13. 

    In the C3 cycle, carbon dioxide is combined with:

    • A.

      RuBP

    • B.

      Oxaloacetate

    • C.

      PGA

    • D.

      Phosophoglycolate

    • E.

      Acetyl-CoA

    Correct Answer
    A. RuBP
    Explanation
    In the C3 cycle, carbon dioxide is combined with RuBP (ribulose-1,5-bisphosphate). This combination is catalyzed by the enzyme Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) to form PGA (3-phosphoglycerate). RuBP acts as a acceptor molecule for carbon dioxide and serves as the starting point for carbon fixation in photosynthesis.

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  • 14. 

    The C4 pathway occurs in plants that are adapted to:

    • A.

      Freshwater habitats

    • B.

      Arctic environments

    • C.

      Areas with a large amount of shade

    • D.

      Conditions of low moisture and intense sunlight

    • E.

      Marine and brackish water habitats

    Correct Answer
    D. Conditions of low moisture and intense sunlight
    Explanation
    The C4 pathway is an adaptation in plants that allows them to efficiently perform photosynthesis in conditions of low moisture and intense sunlight. In these environments, plants need to minimize water loss while maximizing their ability to capture and use sunlight for energy. The C4 pathway helps achieve this by concentrating carbon dioxide in specialized cells, which reduces the need for the stomata (pores on the plant's surface) to be open for extended periods. This reduces water loss through transpiration. Additionally, the C4 pathway allows plants to efficiently convert sunlight into energy, even under intense sunlight conditions.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 01, 2009
    Quiz Created by
    Jweeast

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