Photosynthesis Test: Ultimate MCQ Online Quiz For Grade 11
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Do you know everything there is to know about Photosynthesis? Are you ready to take the ultimate Photosynthesis MCQs online test for Grade 11? Do you know what is the relation between photosynthesis and respiration? Do you know the various stages of photosynthesis? Check out our well-researched Photosynthesis quiz to test your knowledge and learn interesting facts. You can share this quiz with friends to see how much they know.
Questions and Answers
- 1.
Animal cells cannot carry out photosynthesis because they lack ___________________.
- A.
Mitochondria
- B.
Ribosomes
- C.
Chloroplasts
Correct Answer
C. ChloroplastsExplanation
Animal cells cannot carry out photosynthesis because they lack chloroplasts. Chloroplasts are the organelles responsible for photosynthesis, the process by which plants convert sunlight into energy. They contain chlorophyll, a pigment that captures light energy, and other molecules necessary for photosynthesis. Without chloroplasts, animal cells are unable to produce their own energy through photosynthesis and must rely on other sources, such as consuming other organisms or organic matter, for their energy needs.Rate this question:
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- 2.
Cellular respiration and photosynthesis are similar in that both involve
- A.
The production of sugars
- B.
The release of O2 in the atmosphere
- C.
None of the above
Correct Answer
C. None of the aboveExplanation
Cellular respiration and photosynthesis are similar in several respects, such as involving electron transport chains and the utilization of ATP, but neither of the options given in the question correctly describes a similarity:
The production of sugars - This primarily occurs during photosynthesis, where plants convert carbon dioxide and water into glucose (sugar) and oxygen using sunlight. Cellular respiration, on the other hand, involves the breakdown of glucose (sugar) to produce ATP, carbon dioxide, and water.
The release of O2 in the atmosphere - This is specific to photosynthesis. During photosynthesis, oxygen is produced as a by-product and released into the atmosphere. Cellular respiration consumes oxygen as it helps in breaking down glucose to produce energy.
Therefore, the similarities between the two processes are not correctly captured by either of the options provided, leading to "None of the above" being the correct choice.Rate this question:
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- 3.
What are carbon dioxide and water converted into as a result of photosynthesis?
- A.
Glucose
- B.
Oxygen and glucose
- C.
Carbon dioxide
Correct Answer
B. Oxygen and glucoseExplanation
During photosynthesis, carbon dioxide and water are converted into glucose and oxygen. This process occurs in the chloroplasts of plant cells, specifically in the presence of sunlight and chlorophyll. Carbon dioxide is taken in from the atmosphere through tiny openings in the leaves called stomata, while water is absorbed through the roots and transported to the leaves. Through a series of chemical reactions, the energy from sunlight is used to convert carbon dioxide and water into glucose, a type of sugar that serves as the main source of energy for plants. Oxygen is also produced as a byproduct and is released into the atmosphere.Rate this question:
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- 4.
Plants capture light energy from the sun and use it to convert carbon dioxide and water into food. This process is known as
- A.
Photosynthesis
- B.
Evaporation
- C.
Transpiration
Correct Answer
A. pHotosynthesisExplanation
Plants capture light energy from the sun and use it to convert carbon dioxide and water into food. This process is known as photosynthesis. During photosynthesis, plants use chlorophyll in their leaves to absorb sunlight and convert it into chemical energy. This energy is then used to convert carbon dioxide from the air and water from the roots into glucose (sugar), which serves as food for the plant. Photosynthesis is essential for plant growth and oxygen production, making it the correct answer in this context.Rate this question:
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- 5.
Which of these describes photosynthesis?
- A.
It requires energy from the sun
- B.
It requires energy from food
- C.
It releases energy from food
Correct Answer
A. It requires energy from the sunExplanation
Photosynthesis is a process by which green plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose (food) and oxygen. The process occurs in chloroplasts within plant cells and requires energy from the sun to drive the chemical reactions involved. Therefore, the statement "It requires energy from the sun" accurately describes photosynthesis.Rate this question:
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- 6.
Which of the following is provided directly by the sun to plants for photosynthesis?
- A.
Energy
- B.
Carbon dioxide
- C.
Oxygen
Correct Answer
A. EnergyExplanation
Plants require energy from the sun in order to carry out photosynthesis. During this process, sunlight is absorbed by chlorophyll in the plant's leaves, which is then used to convert carbon dioxide and water into glucose and oxygen. This energy is crucial for the plant to synthesize its own food and carry out various metabolic processes. Therefore, energy is directly provided by the sun to plants for photosynthesis.Rate this question:
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- 7.
What is the main pigment in green plants?
- A.
Chloroplasts
- B.
Chlorophyll
- C.
Ribosomes
Correct Answer
B. ChloropHyllExplanation
Chlorophyll is the main pigment in green plants. It is responsible for absorbing light energy from the sun and converting it into chemical energy through the process of photosynthesis. Chlorophyll gives plants their green color and is located in the chloroplasts, which are the organelles responsible for photosynthesis. Ribosomes are not pigments and do not play a role in photosynthesis. Therefore, the correct answer is chlorophyll.Rate this question:
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- 8.
During photosynthesis, producers convert energy from the sun into __________.
- A.
Electrical energy
- B.
Chemical energy
- C.
Mechanical energy
Correct Answer
B. Chemical energyExplanation
During photosynthesis, producers, such as plants, use sunlight to convert carbon dioxide and water into glucose and oxygen. This process involves capturing the energy from the sun and storing it in the chemical bonds of glucose molecules. Therefore, the correct answer is chemical energy, as photosynthesis is the process by which producers convert solar energy into chemical energy in the form of glucose.Rate this question:
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- 9.
Plants provide animals with _________________.
- A.
Food and 02 (oxygen)
- B.
Food
- C.
Carbon dioxide
Correct Answer
A. Food and 02 (oxygen)Explanation
Plants provide animals with food and oxygen. Plants produce oxygen through a process called photosynthesis, where they use sunlight, water, and carbon dioxide to create glucose and release oxygen as a byproduct. This oxygen is essential for the survival of animals as they require it for respiration. Additionally, plants also serve as a food source for animals, providing them with nutrients and energy. Therefore, plants play a crucial role in sustaining the life of animals by supplying them with both food and oxygen.Rate this question:
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- 10.
Photosynthesis could not occur without which of the following?
- A.
Sunlight
- B.
Glucose
- C.
Oxygen
Correct Answer
A. SunlightExplanation
Photosynthesis is the process by which plants convert sunlight into energy in the form of glucose and release oxygen as a byproduct. Without sunlight, plants would not be able to carry out photosynthesis, as it is the primary source of energy for this process. Glucose and oxygen are products of photosynthesis, but they are not necessary for photosynthesis to occur.Rate this question:
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- 11.
Why do some leaves turn from green to red, orange, or yellow in the fall?
- A.
Chlorophyll changes colors in cool weather.
- B.
Chlorophyll is broken down and is stored
- C.
Chlorophyll leaks out of the leaves.
Correct Answer
B. ChloropHyll is broken down and is storedExplanation
In the fall, as the weather gets cooler, the production of chlorophyll in leaves slows down and eventually stops. Chlorophyll is responsible for the green color of leaves, so when it breaks down and is no longer produced, other pigments in the leaves, such as carotenoids and anthocyanins, become more visible. Carotenoids give leaves their yellow and orange colors, while anthocyanins give them red and purple colors. The breakdown of chlorophyll and the presence of these other pigments result in the vibrant red, orange, and yellow colors that we associate with fall foliage.Rate this question:
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- 12.
Which plant pigment traps most of the light energy used in photosynthesis?
- A.
Carotene
- B.
Chlorophyll
- C.
Betadine
Correct Answer
B. ChloropHyllExplanation
Chlorophyll is the plant pigment that traps most of the light energy used in photosynthesis. It is responsible for absorbing light in the blue and red regions of the electromagnetic spectrum, while reflecting green light, giving plants their characteristic green color. This absorbed light energy is then converted into chemical energy through the process of photosynthesis, where it is used to produce glucose and oxygen. Carotene and betadine are not directly involved in the light trapping process of photosynthesis, making chlorophyll the correct answer.Rate this question:
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- 13.
In an ecosystem, energy __________, and chemicals ____________ through
- A.
Flows, cycles
- B.
Cycles, flows
Correct Answer
A. Flows, cyclesExplanation
In an ecosystem, energy flows from one organism to another through processes such as photosynthesis and consumption. This energy flow is essential for the survival and functioning of the ecosystem. On the other hand, chemicals such as nutrients and minerals cycle within the ecosystem. This means that they are continuously recycled and reused by different organisms through processes like decomposition and nutrient uptake. This cycling of chemicals ensures that the ecosystem maintains a balance and sustains the life within it.Rate this question:
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- 14.
What are the organelles that use sunlight to produce food in the process of photosynthesis?
- A.
Ribosomes
- B.
Chloroplasts
- C.
Vacuoles
Correct Answer
B. ChloroplastsExplanation
Chloroplasts are the organelles that use sunlight to produce food in the process of photosynthesis. They contain a pigment called chlorophyll, which captures energy from sunlight and converts it into chemical energy. This energy is then used to convert carbon dioxide and water into glucose and oxygen. Ribosomes are responsible for protein synthesis, while vacuoles are involved in storage and waste management. Therefore, neither ribosomes nor vacuoles are directly involved in the process of photosynthesis.Rate this question:
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- 15.
In photosynthesis, chlorophyll traps _________________.
- A.
Sunlight
- B.
Carbon dioxide
- C.
Oxygen
Correct Answer
A. SunlightExplanation
Chlorophyll is a pigment found in plants that is responsible for capturing sunlight during the process of photosynthesis. It absorbs light energy from the sun and converts it into chemical energy, which is then used to convert carbon dioxide and water into glucose and oxygen. Therefore, the correct answer is sunlight.Rate this question:
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- 16.
During photosynthesis, producers convert energy from the sun into __________.
- A.
Chemical
- B.
Mechanical
- C.
Kinetic
Correct Answer
A. ChemicalExplanation
During photosynthesis, producers (such as plants) use energy from the sun to convert carbon dioxide and water into glucose (a type of sugar) and oxygen. This process involves the transformation of light energy into chemical energy, which is stored in the glucose molecules. Therefore, the correct answer is "chemical."Rate this question:
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- 17.
In a plant cell, which organelle is the site of photosynthesis?
- A.
Mitochondria
- B.
Chloroplast
- C.
Endoplasmic reticulum
Correct Answer
B. ChloroplastExplanation
The chloroplast is the correct answer because it is the organelle in plant cells where photosynthesis takes place. Photosynthesis is the process by which plants convert sunlight, carbon dioxide, and water into glucose and oxygen. Chloroplasts contain chlorophyll, a pigment that absorbs light energy, and other necessary components for photosynthesis to occur. Mitochondria are responsible for cellular respiration, not photosynthesis, while the endoplasmic reticulum is involved in protein synthesis and lipid metabolism, not photosynthesis.Rate this question:
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- 18.
Why does chlorophyll make plants appear green?
- A.
It converges green light
- B.
It absorbs green light
- C.
It reflects green light
Correct Answer
C. It reflects green lightExplanation
Chlorophyll is the pigment responsible for absorbing light during photosynthesis. It absorbs most colors of light except for green, which it reflects. This reflected green light is what our eyes perceive, making plants appear green.Rate this question:
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- 19.
How is the sugar produced by photosynthesis used?
- A.
Plants and animals use it for food
- B.
Plants only use it for food
- C.
Animals only use it for food
Correct Answer
A. Plants and animals use it for foodExplanation
The sugar produced by photosynthesis is used by both plants and animals for food. Plants use the sugar as an energy source for growth, development, and reproduction. They convert the sugar into other molecules such as starch for storage. Animals, on the other hand, obtain sugar by consuming plants or other animals that have consumed plants. They use the sugar as a source of energy for their metabolic processes and to fuel their activities. Therefore, both plants and animals rely on the sugar produced by photosynthesis for their nutritional needs.Rate this question:
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- 20.
In the above diagram, the plant captures light energy from the sun and uses it to convert carbon dioxide and water into food. The process of producing food in plants is known as:
- A.
Photosynthesis
- B.
Respiration
- C.
Transpiration
Correct Answer
A. pHotosynthesisExplanation
The diagram shows the process of capturing light energy from the sun and using it to convert carbon dioxide and water into food. This process is known as photosynthesis. Respiration is the process of converting food into energy, and transpiration is the process of water loss through plant leaves. However, the diagram does not depict these processes, so the correct answer is photosynthesis.Rate this question:
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- 21.
Which of the following statements accurately describes the role of cyclic electron flow in photosynthesis and its impact on the production of photosynthetic intermediates?
- A.
Cyclic electron flow primarily occurs in the light-dependent reactions of photosynthesis and leads to an increase in the production of ATP, without the production of NADPH or oxygen.
- B.
Cyclic electron flow is a backup process that occurs when there is an excess of NADPH and insufficient ATP, resulting in the enhanced reduction of ferredoxin without influencing the Calvin cycle.
- C.
Cyclic electron flow supplements non-cyclic flow by providing additional ATP necessary for carbon fixation in the Calvin cycle, while also contributing to the synthesis of ribulose bisphosphate.
- D.
Cyclic electron flow is triggered under stress conditions such as high light intensity, resulting in the decreased production of both ATP and NADPH, which negatively affects the Calvin cycle.
Correct Answer
A. Cyclic electron flow primarily occurs in the light-dependent reactions of pHotosynthesis and leads to an increase in the production of ATP, without the production of NADpH or oxygen.Explanation
Cyclic electron flow involves the photosystem I in the light reactions of photosynthesis. It allows for the additional production of ATP, without the generation of NADPH or the release of oxygen. This process is crucial particularly under conditions where the energy needs of the Calvin cycle (which requires more ATP than NADPH) exceed the output of the non-cyclic electron flow. Thus, it helps balance the ATP/NADPH ratio required for the Calvin cycle to effectively synthesize sugars.Rate this question:
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- 22.
Which of the following is provided directly by the sun to plants for photosynthesis?
- A.
Carbon dioxide
- B.
Oxygen
- C.
Energy
Correct Answer
C. EnergyExplanation
The sun provides energy directly to plants for photosynthesis. This energy is in the form of sunlight, which is absorbed by the plants' chlorophyll molecules. The energy from the sun is used by plants to convert carbon dioxide and water into glucose and oxygen through the process of photosynthesis. Without the sun's energy, plants would not be able to carry out photosynthesis and produce food for themselves.Rate this question:
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- 23.
Which is the process plants use to make food?
- A.
Respiration
- B.
Carbon dioxide
- C.
Photosynthesis
Correct Answer
C. pHotosynthesisExplanation
Photosynthesis is the process that plants use to make food. During photosynthesis, plants convert carbon dioxide and sunlight into glucose and oxygen. This process takes place in the chloroplasts of plant cells, specifically in the chlorophyll pigment. The sunlight provides the energy needed for the reaction, while carbon dioxide is absorbed from the atmosphere. Through photosynthesis, plants are able to produce their own food and release oxygen as a byproduct, which is essential for the survival of other living organisms.Rate this question:
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- 24.
What are the organelles that use sunlight to produce food in the process of photosynthesis?
- A.
Ribosomes
- B.
Vacuoles
- C.
Chloroplasts
Correct Answer
C. ChloroplastsExplanation
Chloroplasts are the organelles that use sunlight to produce food in the process of photosynthesis. They contain a pigment called chlorophyll, which captures sunlight and converts it into chemical energy. This energy is then used to convert carbon dioxide and water into glucose, a form of sugar that serves as food for the plant. Ribosomes and vacuoles are not involved in photosynthesis, making chloroplasts the correct answer.Rate this question:
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- 25.
Which substances are needed to make food in plants?
- A.
Oxygen and water
- B.
Glucose and oxygen
- C.
Water and Carbon dioxide
Correct Answer
C. Water and Carbon dioxideExplanation
Plants use a process called photosynthesis to make food. During photosynthesis, plants use water and carbon dioxide to produce glucose, which is a form of sugar that serves as their food source. Oxygen is released as a byproduct of this process. Therefore, the correct answer is water and carbon dioxide.Rate this question:
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Oct 04, 2024Quiz Edited by
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Feb 05, 2015Quiz Created by
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