Biology Honors Test About Photosynthesis
Questions and Answers
- 1.
Energy is required for a variety of life processes including
- A.
Growth and reproduction
- B.
Movement
- C.
Transport of certain materials across cell membranes
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Energy is required for growth and reproduction because these processes involve the synthesis of new molecules and the formation of new cells, which require energy. Movement also requires energy as it involves the contraction of muscles and the movement of body parts. The transport of certain materials across cell membranes, such as ions and nutrients, also requires energy as it involves active transport processes. Therefore, all of these life processes require energy to occur.Rate this question:
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- 2.
Heterotrophs are organisms that can
- A.
Produce food from inorganic molecules and sunlight
- B.
Survive without energy
- C.
Consume other organisms for energy
- D.
Carry out either photosynthesis or chemosynthesis
Correct Answer
C. Consume other organisms for energyExplanation
Heterotrophs are organisms that are unable to produce their own food from inorganic molecules and sunlight. Instead, they rely on consuming other organisms for energy. This means that they obtain their energy by feeding on other living organisms, either by predation or by consuming dead organic matter. Unlike autotrophs, which can produce their own food through photosynthesis or chemosynthesis, heterotrophs must obtain their energy by consuming other organisms.Rate this question:
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- 3.
Based on the cycle of photosynthesis and cellular respiration, one can say that the ultimate original source of energy for al living things on Earth is
- A.
Glucose
- B.
Water
- C.
The sun
- D.
Carbon dioxide
Correct Answer
C. The sunExplanation
The cycle of photosynthesis and cellular respiration involves the conversion of energy from the sun into glucose, which is then used by living organisms as a source of energy. Therefore, the ultimate original source of energy for all living things on Earth is the sun.Rate this question:
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- 4.
The process whereby plants capture energy and make complex molecules is known as
- A.
Homeostatis
- B.
Evolution
- C.
Photosynthesis
- D.
Development
Correct Answer
C. PhotosynthesisExplanation
Photosynthesis is the correct answer because it is the process through which plants capture energy from sunlight and convert it into chemical energy in the form of complex molecules such as glucose. This process involves the absorption of sunlight by chlorophyll in the plant's cells, which then combines carbon dioxide and water to produce glucose and oxygen. Photosynthesis is essential for the survival of plants and is responsible for producing oxygen and providing the basis for most food chains on Earth.Rate this question:
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- 5.
Suspended in the fluid stroma of chloroplasts are
- A.
Organelles called eukaryotes
- B.
Numerous mitochondrial membranes
- C.
Small coins that provide energy
- D.
Stacks of thylakoids called grana
Correct Answer
D. Stacks of thylakoids called granaExplanation
The correct answer is "stacks of thylakoids called grana." Grana are structures found in the chloroplasts of plant cells. They consist of stacks of thylakoids, which are membranous sacs where the light-dependent reactions of photosynthesis occur. These thylakoids contain chlorophyll and other pigments that capture light energy and convert it into chemical energy. The grana are suspended in the fluid stroma of the chloroplasts, which contains enzymes and other molecules involved in the light-independent reactions of photosynthesis.Rate this question:
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- 6.
Photosynthesis:oxygen::
- A.
Respiration:darkness
- B.
Light reactions: dark reactions
- C.
Respiration: carbon dioxide
- D.
Oxygen:carbon dioxide
Correct Answer
C. Respiration: carbon dioxideExplanation
Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen, with the help of sunlight. Similarly, respiration is the process by which organisms break down glucose to release energy, and in the process, carbon dioxide is produced. Therefore, the analogy between photosynthesis and respiration is that just as photosynthesis produces oxygen, respiration produces carbon dioxide.Rate this question:
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- 7.
Biochemical pathway:reaction::
- A.
Barrier:wall
- B.
Match:burn
- C.
Theater:drama
- D.
Assembly line: workers
Correct Answer
C. Theater:dramaExplanation
The relationship between theater and drama is similar to the relationship between a biochemical pathway and a reaction. In both cases, theater and biochemical pathway are the broader concepts, while drama and reaction are specific components or elements within them. Drama is a fundamental part of theater, just like a reaction is a fundamental part of a biochemical pathway. Both theater and biochemical pathways encompass a variety of elements or components, but drama and reaction are crucial aspects that define and contribute to their overall functioning and purpose.Rate this question:
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- 8.
Light reaction:thylakoids
- A.
Grana: thylakoids
- B.
Grana:ATP
- C.
Calvin Cycle : stroma
- D.
Stroma: grana of chloroplasts
Correct Answer
C. Calvin Cycle : stromaExplanation
The Calvin Cycle occurs in the stroma of the chloroplasts. The stroma is the fluid-filled space surrounding the thylakoids, where the light-independent reactions of photosynthesis take place. This is where carbon dioxide is converted into glucose using the energy from ATP and NADPH, which are produced during the light reactions that occur in the thylakoids. Therefore, the Calvin Cycle occurs in the stroma, not in the grana or thylakoids.Rate this question:
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- 9.
The sun is considered the ultimate source of energy for life on Earth because
- A.
All organisms carry out photosynthesis
- B.
All organisms carry out cellular respiration
- C.
Either photosynthetic organisms that have eaten them provide energy for all other organisms on Earth
- D.
The sun heats the Earths atmosphere
Correct Answer
C. Either photosynthetic organisms that have eaten them provide energy for all other organisms on EarthExplanation
Photosynthetic organisms, such as plants and algae, use sunlight to convert carbon dioxide and water into glucose and oxygen through the process of photosynthesis. These organisms are able to capture the sun's energy and store it in the form of glucose. When other organisms consume these photosynthetic organisms, they obtain the energy stored in the glucose through the process of cellular respiration. This energy is then used by all other organisms on Earth for their survival and various life processes. Therefore, the sun is considered the ultimate source of energy for life on Earth because photosynthetic organisms provide energy for all other organisms through the food chain.Rate this question:
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- 10.
The energy from the sun is converted into chemical energy in the form of organic compounds in a series of linked chemical reactions called a
- A.
Photosynthetic reactant
- B.
ATP generator
- C.
Chemical equation
- D.
Biochemical pathway
Correct Answer
D. Biochemical pathwayExplanation
In photosynthesis, the energy from the sun is captured and converted into chemical energy in the form of organic compounds. This process occurs through a series of linked chemical reactions, known as a biochemical pathway. These reactions involve the conversion of carbon dioxide and water into glucose and oxygen, with the help of sunlight and chlorophyll. The pathway is a step-by-step process that allows the energy from the sun to be stored in the chemical bonds of glucose, which can then be used by organisms as a source of energy.Rate this question:
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- 11.
The role of chlorophyll in photosynthesis is to
- A.
Absorb light energy
- B.
Pass electrons to carotenoids
- C.
Split water molecules
- D.
All of the above
Correct Answer
A. Absorb light energyExplanation
Chlorophyll is a pigment found in the chloroplasts of plants and algae. Its main role in photosynthesis is to absorb light energy from the sun. This absorbed energy is then used to convert carbon dioxide and water into glucose and oxygen, which are the main products of photosynthesis. Chlorophyll molecules are able to absorb light in the red and blue regions of the electromagnetic spectrum, while reflecting green light, giving plants their characteristic green color. Therefore, the correct answer is "absorb light energy."Rate this question:
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- 12.
When light strikes an object, the light may be
- A.
Reflected
- B.
Transmitted
- C.
Absorbed
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
When light strikes an object, it can undergo different interactions. Reflection occurs when the light bounces off the surface of the object. Transmission happens when the light passes through the object, either straight through or at an angle. Absorption occurs when the object absorbs the light energy, converting it into another form, such as heat. Therefore, all of the above options (reflected, transmitted, absorbed) are possible outcomes when light strikes an object.Rate this question:
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- 13.
Chlorophyll is green because
- A.
It absorbs green wavelengths
- B.
It absorbs blue and yellow which makes green
- C.
It reflects green
- D.
Transmits light
Correct Answer
C. It reflects greenExplanation
Chlorophyll is green because it reflects green light. When light hits chlorophyll molecules, they absorb certain wavelengths of light, such as blue and red, but reflect or transmit green light. This means that the green light is not absorbed by the chlorophyll and instead is reflected back, giving chlorophyll its green color.Rate this question:
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- 14.
What happens when a chlorophyll molecule absorbs light?
- A.
Some of its electrons are raised to a higher energy level
- B.
It disintegrates, giving off huge amounts of heat
- C.
It glows, radiating green light and giving the plant a green appearance
- D.
It attracts electrons from other molecules
Correct Answer
A. Some of its electrons are raised to a higher energy levelExplanation
When a chlorophyll molecule absorbs light, some of its electrons are raised to a higher energy level. This is because chlorophyll molecules contain a pigment that can absorb light energy. When light is absorbed, it excites the electrons in the chlorophyll molecule, causing them to move to a higher energy level. This energy is then used in the process of photosynthesis, where it is converted into chemical energy that the plant can use for growth and development.Rate this question:
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- 15.
Chloroplast: grana::
- A.
Photosystem: pigment molecules
- B.
Chlorophyll: pigments
- C.
Thylakoids: photosynthesis
- D.
Chlorophyll: green
Correct Answer
A. Photosystem: pigment moleculesExplanation
In this analogy, the relationship between chloroplast and grana is being compared to the relationship between photosystem and pigment molecules. Grana are the stacks of thylakoids within a chloroplast, which are responsible for capturing light energy and carrying out photosynthesis. Similarly, photosystems are groups of pigment molecules that are embedded in the thylakoid membrane and are essential for capturing and transferring light energy during photosynthesis. Therefore, the correct answer is photosystem: pigment molecules.Rate this question:
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- 16.
When electrons of a chlorophyll molecule are raised to a higher energy level,
- A.
They become a particle of light
- B.
They form a glucose bond
- C.
They enter an electron transport chain
- D.
They enter the calvin cycle
Correct Answer
C. They enter an electron transport chainExplanation
When electrons of a chlorophyll molecule are raised to a higher energy level, they enter an electron transport chain. This is because the energy from the excited electrons is used to drive a series of chemical reactions in the electron transport chain, which ultimately leads to the production of ATP (adenosine triphosphate), the energy currency of the cell. The electron transport chain is an essential part of photosynthesis, where it helps to convert light energy into chemical energy in the form of ATP.Rate this question:
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- 17.
NADP is important in photosynthesis because it
- A.
Becomes oxidized to form NADP
- B.
Is needed to form chlorophyll
- C.
Provides additional oxygen atoms
- D.
Provides protons and electrons for some reactions
Correct Answer
D. Provides protons and electrons for some reactionsExplanation
NADP is important in photosynthesis because it provides protons and electrons for some reactions. During the light-dependent reactions of photosynthesis, NADP+ accepts electrons and protons from water molecules that are split, forming NADPH. This NADPH is then used in the light-independent reactions to reduce carbon dioxide and produce glucose. Without NADP providing protons and electrons, these reactions would not be able to proceed, and the production of glucose would be hindered.Rate this question:
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- 18.
The source of oxygen produced during photosynthesis is
- A.
Carbon dioxide
- B.
Water
- C.
Chlorophyll
- D.
Glucose
Correct Answer
B. WaterExplanation
During photosynthesis, plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. The process takes place in the chloroplasts, where chlorophyll captures sunlight energy. Carbon dioxide is obtained from the atmosphere, while water is absorbed from the roots. Through a series of chemical reactions, the energy from sunlight is used to split water molecules, releasing oxygen as a byproduct. Therefore, the correct answer is water.Rate this question:
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- 19.
The major atmospheric byproduct of photosynthesis is
- A.
Nitorgen
- B.
Carbon dioxide
- C.
Water
- D.
Oxygen
Correct Answer
D. OxygenExplanation
During photosynthesis, plants use carbon dioxide, water, and sunlight to produce glucose and oxygen. The oxygen produced is released into the atmosphere as a byproduct of this process. Therefore, the correct answer is oxygen.Rate this question:
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- 20.
During the Calvin cycle, carbon-containing molecules are produced from
- A.
Carbon atoms from ATP
- B.
Carbon atoms, hydrogen atoms, and oxygen atoms from glucose
- C.
Carbon atoms from carbon dioxide in the air and hydrogen atoms from water
- D.
Carbon atoms from carbon dioxide int he air and hydrogen atoms from NADPH
Correct Answer
D. Carbon atoms from carbon dioxide int he air and hydrogen atoms from NADPHExplanation
During the Calvin cycle, carbon-containing molecules are produced from carbon atoms from carbon dioxide in the air and hydrogen atoms from NADPH. This is because the Calvin cycle is a part of photosynthesis, where carbon dioxide is converted into glucose. The carbon atoms from carbon dioxide combine with hydrogen atoms from NADPH, which is a coenzyme involved in the transfer of high-energy electrons during photosynthesis. Together, these carbon and hydrogen atoms are used to synthesize glucose and other carbon-containing molecules in the Calvin cycle.Rate this question:
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- 21.
Which of the following process occurs in the thylakoid membrane and converts captured light energy into chemical energy?
- A.
The Calvin cycle
- B.
ATP synthase
- C.
Light absorption
- D.
Chemiosmosis
Correct Answer
C. Light absorptionExplanation
Light absorption is the process that occurs in the thylakoid membrane and converts captured light energy into chemical energy. This process involves the absorption of photons by pigments such as chlorophyll, which then excites electrons and initiates a series of reactions that eventually lead to the production of ATP and NADPH, which are used in the Calvin cycle to convert carbon dioxide into glucose. ATP synthase is responsible for the synthesis of ATP, chemiosmosis is the movement of protons across the thylakoid membrane to generate a proton gradient.Rate this question:
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- 22.
Products of the light reactions of photosynthesis that provide energy for the Calvin cycle are
- A.
Oxygen and ATP
- B.
Water and oxygen
- C.
ATP and NADPH
- D.
Oxygen and NADPH
Correct Answer
C. ATP and NADPHExplanation
The products of the light reactions of photosynthesis that provide energy for the Calvin cycle are ATP and NADPH. These two molecules are essential as they supply the energy and reducing power needed for the synthesis of carbohydrates from carbon dioxide in the Calvin cycle. Oxygen is also a product of the light reactions, but it does not participate in the Calvin cycle; it is released into the atmosphere.Rate this question:
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- 23.
The Calvin cycle of photosynthesis
- A.
Requires ATP and NADPH
- B.
Can occur in both light and dark conditions
- C.
Generates glucose
- D.
All of the above
Correct Answer
A. Requires ATP and NADPHExplanation
The correct answer is:
- Requires ATP and NADPH
The Calvin cycle of photosynthesis is a series of chemical reactions that take place in the stroma of the chloroplasts in plant cells. It is responsible for converting carbon dioxide (CO2) into glucose and other organic molecules. The Calvin cycle does require ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate) as energy and reducing power, respectively, which are produced during the light-dependent reactions of photosynthesis. These energy-rich molecules are used to power the Calvin cycle and convert CO2 into glucose.
The other two statements are not entirely accurate:
- The Calvin cycle cannot occur in both light and dark conditions. It is a light-independent process that occurs in the stroma of the chloroplasts, but it relies on the products (ATP and NADPH) generated during the light-dependent reactions, which occur in the presence of light.
- While the Calvin cycle is involved in the synthesis of glucose and other sugars, it doesn't directly generate glucose as a final product. It produces triose phosphates, which can be used to build glucose and other carbohydrates through subsequent metabolic processes.Rate this question:
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- 24.
The energy used in the Calvin cycle for the production of carbohydrate molecules comes from
- A.
ATP made during cellular respiration
- B.
The Krebs cycle
- C.
ATP made in the light reactions of photosynthesis
- D.
CO2 absorbed during the last stage of photosynthesis
Correct Answer
A. ATP made during cellular respirationExplanation
During the Calvin cycle, CO2 is utilized to produce carbohydrate molecules. This process occurs in the stroma of chloroplasts, which is the last stage of photosynthesis. The energy required for this process is obtained from ATP and NADPH, which are produced in the light reactions of photosynthesis. Therefore, the correct answer is CO2 absorbed during the last stage of photosynthesis.Rate this question:
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- 25.
All organic molecules contain carbon atoms that ultimately can be traced back in the food chain to
- A.
The bodies of heterotrophs
- B.
Carbon dioxide from the atmosphere
- C.
Water absorbed by plants
- D.
The carbon the comes from the sun
Correct Answer
B. Carbon dioxide from the atmosphereExplanation
All organic molecules contain carbon atoms, which are essential for life. These carbon atoms can be traced back in the food chain to carbon dioxide from the atmosphere. Plants, as autotrophs, use carbon dioxide from the atmosphere during photosynthesis to produce organic molecules. Heterotrophs, such as animals, obtain these organic molecules by consuming plants or other animals. Therefore, the carbon atoms in organic molecules can ultimately be traced back to carbon dioxide from the atmosphere.Rate this question:
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- 26.
Which of the following can be produced from the products of the Calvin cycle
- A.
Carbohydrates
- B.
Lipids
- C.
Proteins
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The products of the Calvin cycle include glucose, which is a carbohydrate, as well as glycerol and fatty acids, which are the building blocks of lipids. Additionally, the Calvin cycle also produces amino acids, which are the building blocks of proteins. Therefore, all three options - carbohydrates, lipids, and proteins - can be produced from the products of the Calvin cycle.Rate this question:
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- 27.
The balanced equation of photosynthesis
Correct Answer
6CO₂+6H₂0 light energy>C₆H₁₂O₆+6O₂Explanation
The given equation represents the process of photosynthesis, where carbon dioxide (CO₂) and water (H₂O) are converted into glucose (C₆H₁₂O₆) and oxygen (O₂) in the presence of light energy. This equation shows the balanced stoichiometry of the reaction, with 6 molecules of CO₂ and 6 molecules of H₂O reacting to produce 1 molecule of C₆H₁₂O₆ and 6 molecules of O₂. The light energy is necessary for the reaction to occur and is represented by the arrow.Rate this question:
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