General Biology Trivia Quiz On Photosynthesis!

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  • 1/20 Questions

    Which of these types of organisms produce the biosphere's food supply?

    • Consumers
    • Autotrophs
    • Heterotrophs
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About This Quiz


What do you know about photosynthesis? Do you agree you could pass this quiz? Photosynthesis is the transfer of energy from the sun to the plant. The plant either uses it or stores it away for later. It is a means by which green plants use sunlight to create their food. Plants are the only living thing that can do this. Try taking this quiz to find out how much you understand about photosynthesis.

General Biology Trivia Quiz On Photosynthesis! - Quiz

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  • 2. 

    Which one of the following colors is most strongly reflected by chlorophyll?

    • Red

    • Orange

    • Blue

    • Green

    • Yellow

    Correct Answer
    A. Green
    Explanation
    Chlorophyll is the pigment responsible for capturing light energy in plants for photosynthesis. It absorbs light most strongly in the blue and red regions of the electromagnetic spectrum, while reflecting or transmitting green light. This is why plants appear green to our eyes. Therefore, the color green is most strongly reflected by chlorophyll.

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  • 3. 

    In photosynthesis, plants use carbon from _____ to make sugar and other organic molecules.

    • Carbon dioxide

    • The sun

    • Water

    Correct Answer
    A. Carbon dioxide
    Explanation
    Plants use carbon dioxide in photosynthesis to make sugar and other organic molecules. During photosynthesis, plants capture carbon dioxide from the atmosphere and convert it into glucose, which is used as a source of energy. This process takes place in the chloroplasts of plant cells, where sunlight provides the energy needed to drive the chemical reactions. Water is also required in photosynthesis, but it is used to provide hydrogen atoms for the synthesis of glucose, while carbon dioxide is the source of carbon atoms. The sun is necessary for photosynthesis to occur, but it does not directly provide the carbon needed for sugar production.

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  • 4. 

    How does carbon dioxide enter the leaf?

    • Through the vascular system

    • Through the chloroplasts

    • Through the stomata

    Correct Answer
    A. Through the stomata
    Explanation
    Carbon dioxide enters the leaf through the stomata. Stomata are small openings on the surface of the leaf that allow gases to enter and exit the plant. When the stomata are open, carbon dioxide from the atmosphere diffuses into the leaf and reaches the chloroplasts where photosynthesis takes place. The vascular system, on the other hand, is responsible for transporting water and nutrients throughout the plant, but it does not directly play a role in the entry of carbon dioxide into the leaf.

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  • 5. 

    What effect does photosynthesis have on the greenhouse effect?

    • It reduces atmospheric carbon dioxide and thus reduces greenhouse warming.

    • It increases atmospheric carbon dioxide and thus increases the greenhouse effect.

    • It increases atmospheric carbon dioxide and thus reduces the greenhouse effect.

    • It has no impact on the greenhouse effect.

    • It reduces atmospheric carbon dioxide and thus increases greenhouse warming.

    Correct Answer
    A. It reduces atmospheric carbon dioxide and thus reduces greenhouse warming.
    Explanation
    Photosynthesis is the process by which plants convert carbon dioxide into oxygen, reducing the amount of carbon dioxide in the atmosphere. Since carbon dioxide is a greenhouse gas that contributes to the greenhouse effect and global warming, reducing its concentration helps to mitigate the greenhouse effect. Therefore, photosynthesis reduces atmospheric carbon dioxide and thus reduces greenhouse warming.

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  • 6. 

    When chloroplast pigments absorb light, _____.

    • They gain electrons

    • They lose energy

    • Their electrons become excited

    • Their protons become exictied

    Correct Answer
    A. Their electrons become excited
    Explanation
    When chloroplast pigments absorb light, their electrons become excited. This means that the energy from the absorbed light causes the electrons in the pigments to move to a higher energy state. This excited state allows the electrons to participate in various chemical reactions, such as the conversion of light energy into chemical energy through photosynthesis.

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  • 7. 

    The wavelengths of light absorbed by pigments in the granum are mainly in which range?

    • Green, which is why plants are green

    • Blue-violet and red-orange

    • The range absorbed by carotenoids

    Correct Answer
    A. Blue-violet and red-orange
    Explanation
    The pigments in the granum primarily absorb light in the blue-violet and red-orange range. This means that these wavelengths of light are absorbed by the pigments, while other wavelengths are reflected. This is why plants appear green to us, as green light is not absorbed but rather reflected by the pigments. Additionally, carotenoids also absorb light in a specific range, but the question does not specify that this is the main range of absorption in the granum.

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  • 8. 

    The photosynthetic event known as the Calvin cycle occurs in the _____.

    • Stroma

    • Thylakoid membrane

    • Nucleus

    • Stomata

    Correct Answer
    A. Stroma
    Explanation
    The Calvin cycle, which is a series of biochemical reactions that take place in the chloroplasts of plants, occurs in the stroma. The stroma is the fluid-filled space within the chloroplasts, where the enzymes and other molecules necessary for the Calvin cycle are located. This is where carbon dioxide is converted into glucose using the energy from sunlight, and it is an essential part of the process of photosynthesis. The thylakoid membrane, nucleus, and stomata are not directly involved in the Calvin cycle.

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  • 9. 

    The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from _____.

    • Light

    • Water

    • Carbon dioxide

    • Glucose

    Correct Answer
    A. Water
    Explanation
    Through experiments using radioactive tracers, it has been determined that the source of the oxygen produced by photosynthesis is water. This means that during the process of photosynthesis, water molecules are split, releasing oxygen as a byproduct.

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  • 10. 

    The "photo-" part of the word "photosynthesis" refers to _____, whereas "-synthesis" refers to _____.

    • The reactions in the stomata ... the reactions in the thylakoid

    • He Calvin cycle ... the incorporation of carbon dioxide

    • The light reactions that occur in the thylakoids ... the incorporation of carbon dioxide

    • The light reactions ... reactions in the thylakoids

    Correct Answer
    A. The light reactions that occur in the thylakoids ... the incorporation of carbon dioxide
    Explanation
    The "photo-" part of the word "photosynthesis" refers to the light reactions that occur in the thylakoids, whereas "-synthesis" refers to the incorporation of carbon dioxide.

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  • 11. 

    Cellular respiration and photosynthesis are similar in that both involve _____.

    • The release of O2 into the atmosphere

    • Redox reactions

    • The production of sugars

    Correct Answer
    A. Redox reactions
    Explanation
    Cellular respiration and photosynthesis are similar in that both involve redox reactions. Redox reactions, also known as oxidation-reduction reactions, involve the transfer of electrons from one molecule to another. In cellular respiration, glucose is oxidized and oxygen is reduced to produce energy in the form of ATP. In photosynthesis, water is oxidized and carbon dioxide is reduced to produce glucose and oxygen. Both processes rely on redox reactions to transfer electrons and produce energy or organic molecules.

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  • 12. 

    During photosynthesis in chloroplasts, O2 is produced from _____ via a series of reactions associated with _____.

    • H2O ... NADPH-producing photosystem

    • H2O ... the water-splitting photosystem

    • CO2 ... both the NADPH-producing photosystem

    • CO2 ... Calvin cycle

    Correct Answer
    A. H2O ... the water-splitting photosystem
    Explanation
    During photosynthesis in chloroplasts, O2 is produced from H2O via a series of reactions associated with the water-splitting photosystem. This process, known as photolysis, occurs in the thylakoid membrane of the chloroplast. The water-splitting photosystem, also known as Photosystem II, uses light energy to split water molecules into oxygen, protons (H+), and electrons. The oxygen released is a byproduct of this reaction and is essential for sustaining life on Earth.

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  • 13. 

    Both mitochondria and chloroplasts _____.

    • Obtain electrons from water

    • Reduce NAD+, forming NADP

    • Are surrounded by a single membrane

    • Use an H+ gradient to produce ATP

    Correct Answer
    A. Use an H+ gradient to produce ATP
    Explanation
    Mitochondria and chloroplasts both use an H+ gradient to produce ATP. This process, known as chemiosmosis, involves the movement of protons across a membrane, which creates a gradient of H+ ions. This gradient is then used by ATP synthase to generate ATP. Mitochondria use this process during cellular respiration, while chloroplasts use it during photosynthesis.

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  • 14. 

    Why is NADP+ needed in photosynthesis?

    • It helps produce ATP from the light reactions.

    • It absorbs light energy.

    • It forms part of the water-splitting photosystem.

    • It is the primary electron acceptor.

    • It forms NADPH to be used in the Calvin cycle.

    Correct Answer
    A. It forms NADPH to be used in the Calvin cycle.
    Explanation
    NADP+ is needed in photosynthesis because it is converted into NADPH, which is an essential molecule in the Calvin cycle. The Calvin cycle is the second stage of photosynthesis where carbon dioxide is converted into glucose. NADPH provides the necessary electrons and hydrogen ions for this process. Without NADP+, the Calvin cycle would not be able to proceed, and glucose production would be hindered. Therefore, NADP+ plays a crucial role in photosynthesis by forming NADPH to be used in the Calvin cycle.

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  • 15. 

    In an experiment, a plant was given _____ containing radioactive 18O, and the radioactive oxygen atoms were used to make sugar.

    • Water

    • Carbon dioxide

    • Oxygen gas

    Correct Answer
    A. Carbon dioxide
    Explanation
    Plants undergo a process called photosynthesis where they convert carbon dioxide and water into glucose (sugar) and oxygen using energy from sunlight. In this experiment, the plant was given carbon dioxide containing radioactive 18O, which means that the oxygen atoms in the carbon dioxide were radioactive. These radioactive oxygen atoms were then used by the plant to synthesize sugar through photosynthesis.

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  • 16. 

    Carbon dioxide makes up about _____ of the air we breathe.

    • 0.03%

    • 0.30%

    • 3.00%

    Correct Answer
    A. 0.03%
    Explanation
    Carbon dioxide makes up about 0.03% of the air we breathe. This is a relatively small percentage, indicating that carbon dioxide is a minor component of the Earth's atmosphere. Despite its low concentration, carbon dioxide plays a crucial role in the Earth's climate system and is a greenhouse gas that contributes to global warming.

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  • 17. 

    The _____ of photosynthesis performs a task similar to that of the _____ of cellular respiration.

    • NADP+ ... NADH

    • Calvin cycle ... electron transport

    • NADPH ... NADH

    Correct Answer
    A. NADPH ... NADH
    Explanation
    The correct answer is NADPH ... NADH. During photosynthesis, NADPH is produced in the light-dependent reactions and carries high-energy electrons to the Calvin cycle, where it acts as a reducing agent. Similarly, during cellular respiration, NADH is produced in the Krebs cycle and carries high-energy electrons to the electron transport chain, where it donates these electrons to generate ATP. Both NADPH and NADH play crucial roles in transferring energy during these processes.

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  • 18. 

    The light reactions of photosynthesis generate high-energy electrons, which end up in _____. The light reactions also produce _____ and _____.

    • ATP ... NADPH ... oxygen

    • Oxygen ... sugar ... ATP

    • Chlorophyll ... ATP ... NADPH

    • NADPH ... ATP ... oxygen

    Correct Answer
    A. NADPH ... ATP ... oxygen
    Explanation
    During the light reactions of photosynthesis, high-energy electrons are generated. These electrons are then transferred to NADP+ to form NADPH, which is an energy-rich molecule used in the Calvin cycle to produce sugar. Additionally, the light reactions also produce ATP, which is another energy molecule used in the Calvin cycle. Finally, oxygen is released as a byproduct of the light reactions.

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  • 19. 

    The Calvin cycle is a series of reactions that _____.

    • Produce oxygen gas

    • Convert light energy to chemical energy

    • Produce NADPH

    • Assemble sugar molecules by incorporating carbon

    • All of the above

    Correct Answer
    A. Assemble sugar molecules by incorporating carbon
    Explanation
    The Calvin cycle is a series of reactions that assemble sugar molecules by incorporating carbon. This process occurs in the stroma of chloroplasts and is an essential part of photosynthesis. The cycle uses carbon dioxide, ATP, and NADPH to produce glucose, which is a form of chemical energy. The Calvin cycle does not directly produce oxygen gas or NADPH, although it relies on the products of the light-dependent reactions, which produce oxygen gas and NADPH. Therefore, the correct answer is "assemble sugar molecules by incorporating carbon".

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  • 20. 

    In photosynthesis, what is the fate of the oxygen atoms present in CO2? They end up _____

    • In sugar molecules

    • As molecular oxygen and in sugar molecules

    • In sugar molecules and in water

    Correct Answer
    A. In sugar molecules and in water
    Explanation
    During photosynthesis, the oxygen atoms present in CO2 are utilized to form sugar molecules and water. This process involves the conversion of carbon dioxide and water into glucose and oxygen through the use of sunlight and chlorophyll. Oxygen atoms from CO2 are released as molecular oxygen (O2) into the atmosphere, while others are incorporated into sugar molecules and water, which are essential for the plant's growth and energy production.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 14, 2011
    Quiz Created by
    Rositaross
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