Year 6 Plants Photosynthesis Quiz
Questions and Answers
- 1.
What is the source of light used in photosynthesis?
- A.
Moon
- B.
Sun
- C.
Grow light
Correct Answer
B. SunExplanation
Photosynthesis is the process by which plants convert light energy into chemical energy to produce glucose. The source of this light energy is the sun. Sunlight contains a full spectrum of light, including the necessary wavelengths (mainly red and blue) that plants absorb and use for photosynthesis. While grow lights can also provide the required light for photosynthesis, the sun is the primary and most natural source of light used in this process. The moon does not emit its own light and therefore cannot be the source of light for photosynthesis.Rate this question:
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- 2.
What chemical enters the leaf from the air? Use the diagram from Question 1 to help you.
- A.
Oxygen
- B.
Nitrogen
- C.
Carbon dioxide
- D.
Chlorophyll
Correct Answer
C. Carbon dioxideExplanation
Carbon dioxide enters the leaf from the air. This is because during photosynthesis, plants use carbon dioxide from the air, along with water and sunlight, to produce glucose and oxygen. The carbon dioxide is absorbed through small pores called stomata on the surface of the leaf. It then travels through the leaf's tissues to reach the chloroplasts, where it is used in the process of photosynthesis.Rate this question:
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- 3.
When we talk about the "food factories" in a leaf, what specific parts of the leaf are we referring to?
- A.
Chlorophyll
- B.
Chloroplasts
- C.
Stoma
- D.
Sponge cell
Correct Answer
B. ChloroplastsExplanation
The specific parts of the leaf that we are referring to when we talk about "food factories" are the chloroplasts. Chloroplasts are responsible for photosynthesis, the process by which plants convert sunlight into energy-rich molecules like glucose. They contain chlorophyll, a pigment that captures light energy, and other necessary components for photosynthesis. The chloroplasts are where the actual food production occurs, making them the true "food factories" of the leaf.Rate this question:
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- 4.
The leaf makes food in the form of what kind of energy? Use the diagram to find the answer.
- A.
White sugar
- B.
Brown sugar
- C.
Cane sugar
- D.
Glucose or simple sugar
Correct Answer
D. Glucose or simple sugar -
- 5.
What is the other substance that is released into the air when the leaf makes its food?
- A.
Water
- B.
Carbon dioxide
- C.
Oxygen
- D.
Glucose
Correct Answer
C. OxygenExplanation
When a leaf makes its food through the process of photosynthesis, it releases oxygen as a byproduct. This is because during photosynthesis, carbon dioxide is taken in by the leaf and combined with water to produce glucose, which is used as energy by the plant. Oxygen is released as a waste product into the air. Therefore, the correct answer is oxygen.Rate this question:
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- 6.
We know that a leaf needs 4 things in order to complete the process of photosynthesis. What are these four things? Use the diagram to help you.
- A.
Carbon dioxide, water, sunlight, chlorophyll
- B.
Oxygen, water, sunlight, chlorophyll
- C.
Oxygen, soil, sunlight, chlorophyll
- D.
Carbon dioxide, minerals, sunlight, chlorophyll
Correct Answer
A. Carbon dioxide, water, sunlight, chloropHyllExplanation
The correct answer is carbon dioxide, water, sunlight, chlorophyll. This is because photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen, using sunlight as an energy source and chlorophyll to capture the sunlight. Oxygen is produced as a byproduct of this process. Soil and minerals are not directly involved in photosynthesis.Rate this question:
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- 7.
What gas does the leaf give off into the air during photosynthesis?
- A.
Nitrogen
- B.
Carbon dioxide
- C.
Sulfur dioxide
- D.
Oxygen
Correct Answer
D. OxygenExplanation
During photosynthesis, plants use sunlight, water, and carbon dioxide to produce glucose and oxygen. The oxygen produced is released into the air through tiny pores called stomata on the surface of the leaves. Therefore, the correct answer is oxygen.Rate this question:
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- 8.
How does air enter the leaf?
- A.
Holes
- B.
Guard cells
- C.
Cuticle
- D.
Stomata
Correct Answer
D. StomataExplanation
Stomata are tiny openings on the surface of leaves that allow for the exchange of gases, including the entry of air into the leaf. These openings are surrounded by guard cells, which control their opening and closing. The cuticle is a waxy layer that covers the leaf surface and helps to reduce water loss, but it does not directly allow air to enter the leaf. Therefore, the correct answer is stomata.Rate this question:
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- 9.
When you see arrows in a diagram (especially in science), what can you expect the diagram to show?
- A.
Cycle
Correct Answer
A. CycleExplanation
When arrows are present in a diagram, particularly in the context of science, it is likely that the diagram is illustrating a cycle. Arrows often represent the flow or movement of something, indicating a cyclical process or a repetitive pattern. This could include the cycling of matter or energy, the stages of a biological or chemical process, or the recurring events in a system. The presence of arrows suggests a dynamic and interconnected nature, where elements or components are continuously changing or transitioning.Rate this question:
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- 10.
In this process, which occurs in plants and animals, sugars and oxygen join to produce water, carbon dioxide, and energy. What is the process?
- A.
Hydrogenation
- B.
Photosynthesis
- C.
Transpiration
- D.
Respiration
Correct Answer
D. RespirationExplanation
Respiration is the correct answer because it is the process in which sugars and oxygen combine to produce water, carbon dioxide, and energy. This process occurs in both plants and animals. Hydrogenation is the process of adding hydrogen to a substance, photosynthesis is the process in which plants convert sunlight into energy, and transpiration is the process by which plants release water vapor through their leaves.Rate this question:
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- 11.
Green plants make their own food through a process known as...
- A.
Electrolysis
- B.
Chemical Properties
- C.
Preparation
- D.
Photosynthesis
Correct Answer
D. pHotosynthesisExplanation
Green plants make their own food through a process known as photosynthesis. Photosynthesis is the process by which plants convert sunlight, carbon dioxide, and water into glucose (sugar) and oxygen. This process occurs in the chloroplasts of plant cells, specifically in the chlorophyll pigment. Chlorophyll absorbs sunlight energy, which is then used to convert carbon dioxide and water into glucose. Oxygen is released as a byproduct of this process. Photosynthesis is essential for the survival of green plants as it provides them with the energy they need to grow and reproduce.Rate this question:
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- 12.
What are the two raw ingredients that a plant needs in order to produce its food?
- A.
Oxygen and Water
- B.
Soil and Oxygen
- C.
Carbon Dioxide and Water
- D.
Water and Sugar
Correct Answer
C. Carbon Dioxide and WaterExplanation
Plants need carbon dioxide and water to produce their food through a process called photosynthesis. Carbon dioxide is absorbed from the air through tiny openings in the leaves called stomata, while water is absorbed from the soil through the plant's roots. These two raw ingredients, along with sunlight, are used by plants to convert carbon dioxide into glucose (sugar) and release oxygen as a byproduct. Therefore, the correct answer is carbon dioxide and water.Rate this question:
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- 13.
The plant's green color comes from ...
- A.
Chlorophyll
- B.
Chromosomes
- C.
Stomata
- D.
Xylem
Correct Answer
A. ChloropHyllExplanation
Chlorophyll is a pigment found in the chloroplasts of plant cells that is responsible for the green color of plants. It plays a crucial role in photosynthesis, the process by which plants convert sunlight into energy. Chlorophyll absorbs light energy and uses it to convert carbon dioxide and water into glucose and oxygen. This process is essential for the plant's survival and allows it to produce its own food. Therefore, the plant's green color is a result of the presence of chlorophyll.Rate this question:
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- 14.
Chlorophyll is found in special cells in the leaves called ...
- A.
Membranes
- B.
Chloroplasts
- C.
Phloem
- D.
Roots
Correct Answer
B. ChloroplastsExplanation
Chlorophyll, the pigment responsible for photosynthesis, is found in special cells called chloroplasts. Chloroplasts are organelles found in plant cells, specifically in the leaves. These organelles contain chlorophyll and other pigments that capture sunlight and convert it into energy through the process of photosynthesis. Therefore, chloroplasts are the correct answer as they are the specific cellular structures where chlorophyll is located.Rate this question:
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- 15.
The tiny openings on the underside of the leaf that help the plant take in carbon dioxide are called...
- A.
Stomata
- B.
Xylem
- C.
Phloem
- D.
Chlorophyll
Correct Answer
A. StomataExplanation
Stomata are the tiny openings on the underside of the leaf that allow carbon dioxide to enter the plant for photosynthesis. They also allow for the exchange of gases, such as oxygen and water vapor, between the plant and its environment. Xylem and phloem are vascular tissues responsible for transporting water and nutrients throughout the plant. Chlorophyll is a pigment found in chloroplasts that absorbs light energy for photosynthesis.Rate this question:
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- 16.
What does plants release during the process of photosynthesis?
- A.
Carbon Dioxide
- B.
Radon
- C.
Oxygen
- D.
Hydrogen
Correct Answer
C. OxygenExplanation
During the process of photosynthesis, plants release oxygen. Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into glucose (food) and oxygen. Oxygen is a byproduct of this process and is released into the atmosphere through tiny openings in the leaves called stomata. This oxygen is essential for the survival of animals and other organisms that require it for respiration.Rate this question:
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- 17.
Green plants make their own food through a process known as...
- A.
Electrolysis
- B.
Chemical Properties
- C.
Preparation
- D.
Photosynthesis
Correct Answer
D. pHotosynthesisExplanation
Green plants make their own food through a process known as photosynthesis. This process involves the conversion of sunlight, water, and carbon dioxide into glucose and oxygen. The chlorophyll present in the plant's cells captures the energy from sunlight, which is then used to convert carbon dioxide and water into glucose. This glucose serves as the plant's source of energy, while oxygen is released as a byproduct. Photosynthesis is essential for plant growth and is responsible for producing oxygen, which is vital for the survival of many organisms on Earth.Rate this question:
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- 18.
What are the two raw ingredients that a plant needs in order to produce its food?
- A.
Oxygen and Water
- B.
Soil and Oxygen
- C.
Carbon Dioxide and Water
- D.
Water and Sugar
Correct Answer
C. Carbon Dioxide and WaterExplanation
Plants require carbon dioxide and water as the two raw ingredients to produce their food through the process of photosynthesis. Carbon dioxide is obtained from the air through tiny pores called stomata on the leaves. Water is absorbed by the roots from the soil and transported to the leaves through the stem. In the presence of sunlight, chlorophyll in the plant's cells converts carbon dioxide and water into glucose (sugar) and oxygen. This glucose is then used as a source of energy for the plant's growth and development.Rate this question:
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- 19.
The plant's green color comes from ...
- A.
Chlorophyll
- B.
Chromosomes
- C.
Stomata
- D.
Xylem
Correct Answer
A. ChloropHyllExplanation
Chlorophyll is responsible for the green color of plants. It is a pigment found in the chloroplasts of plant cells and is essential for photosynthesis. Chlorophyll absorbs sunlight and uses its energy to convert carbon dioxide and water into glucose and oxygen. This process is crucial for plants to produce their own food and release oxygen into the atmosphere. Therefore, chlorophyll is directly linked to the green coloration of plants.Rate this question:
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- 20.
Chlorophyll is found in special cells in the leaves called ...
- A.
Membranes
- B.
Chloroplasts
- C.
Phloem
- D.
Roots
Correct Answer
B. ChloroplastsExplanation
Chlorophyll is a pigment that is responsible for the green color in plants. It is found in special cells called chloroplasts, which are present in the leaves of plants. Chloroplasts are the organelles where photosynthesis takes place, and they contain chlorophyll molecules that capture sunlight and convert it into energy for the plant. Therefore, the correct answer is chloroplasts.Rate this question:
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- 21.
The tiny openings on the underside of the leaf that help the plant take in carbon dioxide are called...
- A.
Stomata
- B.
Xylem
- C.
Phloem
- D.
Chlorophyll
Correct Answer
A. StomataExplanation
Stomata are the tiny openings on the underside of leaves that allow plants to take in carbon dioxide for photosynthesis. These openings are surrounded by specialized cells that can open and close to regulate the exchange of gases. The xylem and phloem are vascular tissues responsible for transporting water, nutrients, and sugars throughout the plant. Chlorophyll is a pigment found in chloroplasts that captures sunlight for photosynthesis, but it is not directly related to the openings on the leaf.Rate this question:
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- 22.
What does plants release during the process of photosynthesis?
- A.
Carbon Dioxide
- B.
Radon
- C.
Oxygen
- D.
Hydrogen
Correct Answer
C. OxygenExplanation
During the process of photosynthesis, plants release oxygen. Photosynthesis is the process by which plants convert sunlight into energy, using carbon dioxide and water. In this process, oxygen is produced as a byproduct and is released into the atmosphere. This oxygen is vital for the survival of many organisms, including humans, as it is necessary for respiration.Rate this question:
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- 23.
What is the source of light used in photosynthesis?
- A.
Moon
- B.
Sun
- C.
Grow light
Correct Answer
B. SunExplanation
Photosynthesis is the process by which plants convert sunlight into energy. The sun is the primary source of light used in photosynthesis. It provides the necessary energy for plants to convert carbon dioxide and water into glucose and oxygen. Without sunlight, photosynthesis cannot occur, and plants would not be able to produce food for themselves. Therefore, the sun is the correct source of light used in photosynthesis.Rate this question:
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- 24.
What chemical enters the leaf from the air? Use the diagram from Question 1 to help you.
- A.
Oxygen
- B.
Nitrogen
- C.
Carbon dioxide
- D.
Chlorophyll
Correct Answer
C. Carbon dioxideExplanation
Carbon dioxide enters the leaf from the air through tiny openings called stomata. Stomata are present on the surface of the leaf and allow for the exchange of gases between the leaf and the surrounding environment. Carbon dioxide is essential for photosynthesis, the process by which plants convert sunlight into energy. Therefore, carbon dioxide is the correct answer as it is the chemical that enters the leaf from the air.Rate this question:
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- 25.
When we talk about the "food factories" in a leaf, what specific parts of the leaf are we referring to?
- A.
Chlorophyll
- B.
Chloroplasts
- C.
Stoma
- D.
Sponge cell
Correct Answer
B. ChloroplastsExplanation
The "food factories" in a leaf refer to the chloroplasts. Chloroplasts are the organelles found in plant cells, specifically in the mesophyll cells of the leaf. They contain chlorophyll, which is responsible for capturing sunlight and converting it into energy through the process of photosynthesis. Inside the chloroplasts, glucose is produced, which serves as food for the plant. Therefore, when we talk about the "food factories" in a leaf, we are referring to the chloroplasts.Rate this question:
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- 26.
The leaf makes food in the form of what kind of energy? Use the diagram to find the answer.
- A.
White sugar
- B.
Brown sugar
- C.
Cane sugar
- D.
Glucose or simple sugar
Correct Answer
D. Glucose or simple sugarExplanation
The diagram provided shows that the leaf produces glucose or simple sugar as a form of energy. This is the correct answer because glucose is the main product of photosynthesis in plants, where sunlight is converted into chemical energy. Glucose is then used by the plant for energy and growth, or stored as starch for later use. Therefore, glucose or simple sugar is the type of energy produced by the leaf.Rate this question:
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- 27.
What is the other substance that is released into the air when the leaf makes its food?
- A.
Water
- B.
Carbon dioxide
- C.
Oxygen
- D.
Glucose
Correct Answer
C. OxygenExplanation
When leaves make their food through the process of photosynthesis, they release oxygen into the air as a byproduct. Oxygen is produced during photosynthesis when water and carbon dioxide are combined with sunlight and converted into glucose, a form of sugar that the plant uses for energy. Therefore, the correct answer is oxygen.Rate this question:
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- 28.
We know that a leaf needs 4 things in order to complete the process of photosynthesis. What are these four things? Use the diagram to help you.
- A.
Carbon dioxide, water, sunlight, chlorophyll
- B.
Oxygen, water, sunlight, chlorophyll
- C.
Oxygen, soil, sunlight, chlorophyll
- D.
Carbon dioxide, minerals, sunlight, chlorophyll
Correct Answer
A. Carbon dioxide, water, sunlight, chloropHyllExplanation
The process of photosynthesis requires four things: carbon dioxide, water, sunlight, and chlorophyll. Carbon dioxide is necessary for the plant to produce glucose, while water is used to transport nutrients and maintain cell structure. Sunlight provides the energy needed for photosynthesis to occur, and chlorophyll is the pigment that captures light energy and converts it into chemical energy. Oxygen, soil, and minerals are not directly involved in the process of photosynthesis.Rate this question:
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- 29.
What gas does the leaf give off into the air during photosynthesis?
- A.
Nitrogen
- B.
Carbon dioxide
- C.
Sulfur dioxide
- D.
Oxygen
Correct Answer
D. OxygenExplanation
During photosynthesis, plants use sunlight, water, and carbon dioxide to produce glucose and oxygen. The oxygen produced during photosynthesis is released into the air through tiny pores called stomata on the surface of the leaves. Therefore, the correct answer is oxygen.Rate this question:
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- 30.
How does air enter the leaf?
- A.
Holes
- B.
Guard cells
- C.
Cuticle
- D.
Stomata
Correct Answer
D. StomataExplanation
Stomata are small openings on the surface of leaves that allow for the exchange of gases, including the entry of air into the leaf. These openings are surrounded by specialized cells called guard cells, which can open and close the stomata to regulate the flow of gases. The cuticle is a waxy layer on the surface of leaves that helps to prevent water loss, but it does not directly allow for the entry of air. Therefore, stomata is the correct answer as they are the main entry points for air into the leaf.Rate this question:
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- 31.
When you see arrows in a diagram (especially in science), what can you expect the diagram to show?
- A.
Cycle
Correct Answer
A. CycleExplanation
When arrows are present in a diagram, especially in science, it typically indicates a cycle. This means that the diagram is representing a process or sequence that repeats itself in a circular or cyclical manner. The arrows show the direction of the flow or movement within the cycle, highlighting the interconnectedness and continuous nature of the system being depicted.Rate this question:
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- 32.
In this process, which occurs in plants and animals, sugars and oxygen join to produce water, carbon dioxide, and energy. What is the process?
- A.
Hydrogenation
- B.
Photosynthesis
- C.
Transpiration
- D.
Respiration
Correct Answer
D. RespirationExplanation
The process described in the question, where sugars and oxygen combine to form water, carbon dioxide, and energy, is known as respiration. This process occurs in both plants and animals and is essential for the release of energy from food. Hydrogenation is the process of adding hydrogen to a substance, photosynthesis is the process by which plants convert sunlight into energy, and transpiration is the process of water movement through a plant and its evaporation from aerial parts.Rate this question:
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- 33.
What's the microscpic holes on the underside of leaves, that take in carbon dioxide and give out oxygen called?
- A.
Tiny hole.
- B.
Stomata.
- C.
Microscopic hole.
- D.
Cell.
Correct Answer
B. Stomata.Explanation
Stomata are the microscopic holes on the underside of leaves that allow for gas exchange. They take in carbon dioxide and release oxygen through these tiny openings.Rate this question:
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- 34.
What's another name for the "stem"?
- A.
Xylom
- B.
Tubuler
- C.
Xylem
- D.
It has no other name
Correct Answer
C. XylemExplanation
Xylem is another name for the "stem". It is a type of vascular tissue in plants that transports water and nutrients from the roots to the leaves. The xylem is responsible for providing support and structure to the plant, as well as conducting water and minerals throughout the plant's tissues. Therefore, xylem is a suitable alternative term for the stem.Rate this question:
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- 35.
What's a chlorophyll?
- A.
The yellow cell that fills the chloroplast.
- B.
The green pigment that fills the chloloplast but repelles sunlight.
- C.
The green pigment that fills the chloroplast and also absorbs sunlight.
- D.
A cell
Correct Answer
C. The green pigment that fills the chloroplast and also absorbs sunlight.Explanation
Chlorophyll is a green pigment that is responsible for the absorption of light energy in plants. It is found in the chloroplasts, which are specialized organelles in plant cells where photosynthesis takes place. Chlorophyll absorbs light energy, particularly in the red and blue regions of the electromagnetic spectrum, and uses it to convert carbon dioxide and water into glucose and oxygen through the process of photosynthesis. Therefore, the correct answer is "the green pigment that fills the chloroplast and also absorbs sunlight."Rate this question:
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- 36.
True or false: the stomata closes or opens depending on the temperature?
- A.
True.
- B.
False?
Correct Answer
A. True.Explanation
Stomata are small openings on the surface of leaves that allow for gas exchange. They can open and close to regulate the entry of carbon dioxide and the release of oxygen and water vapor. The opening and closing of stomata is influenced by various factors, including temperature. In general, stomata tend to open in response to higher temperatures to facilitate the exchange of gases for photosynthesis. Therefore, the statement that stomata close or open depending on the temperature is true.Rate this question:
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- 37.
The main pigment in leaves i
- A.
Chlorophyll
- B.
Chloroplasts
- C.
Plastids
- D.
Carotonoid
Correct Answer
A. ChloropHyllExplanation
Chlorophyll is the main pigment in leaves that is responsible for capturing sunlight and converting it into energy through the process of photosynthesis. It gives leaves their green color and is found in the chloroplasts, which are specialized organelles within plant cells. Chlorophyll absorbs light in the red and blue regions of the electromagnetic spectrum and reflects green light, which is why leaves appear green to the human eye. Carotenoids are another group of pigments found in plants, but they play a secondary role in photosynthesis and are responsible for the yellow, orange, and red colors seen in leaves during autumn.Rate this question:
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- 38.
The main products of photosynthesis are:
- A.
Glucose and water
- B.
Water and carbon dioxide
- C.
ATP and NADPH
- D.
Glucose and oxygen
- E.
Oxygen and water
Correct Answer
D. Glucose and oxygenExplanation
During photosynthesis, plants use sunlight, water, and carbon dioxide to produce glucose and oxygen. Glucose is a sugar that serves as the primary source of energy for plants. Oxygen is a byproduct of photosynthesis and is released into the atmosphere. Therefore, the correct answer is "Glucose and oxygen."Rate this question:
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- 39.
The main colors used by plants in photosynthesis are
- A.
Purple and Gree
- B.
Blue and Yellow
- C.
Red and orange
- D.
Red and Blue
- E.
Purple and Blue
Correct Answer
D. Red and BlueExplanation
Plants primarily use red and blue colors for photosynthesis. This is because chlorophyll, the pigment responsible for capturing light energy, absorbs light most efficiently in the red and blue regions of the spectrum. The red and blue light is absorbed by chlorophyll and used to convert carbon dioxide and water into glucose and oxygen through the process of photosynthesis. Other colors, such as green, are not absorbed as efficiently and are instead reflected, giving plants their green color.Rate this question:
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- 40.
Light Dependent reactions occur in the
- A.
Stroma
- B.
Thylakoids
- C.
Mitochondria
- D.
Cytoplasm
Correct Answer
B. ThylakoidsExplanation
The light-dependent reactions of photosynthesis occur in the thylakoids. Thylakoids are membrane-bound compartments found within the chloroplasts of plant cells. They contain the photosystems and electron transport chains necessary for capturing light energy and converting it into chemical energy in the form of ATP and NADPH. These reactions require light and take place in the thylakoid membranes, specifically in the regions where the photosystems are located. The other options (Stroma, Mitochondria, and Cytoplasm) are not the correct locations for the light-dependent reactions to occur.Rate this question:
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- 41.
The calvin cycle must go around ____ times to make one sugar.
- A.
One
- B.
Two
- C.
Four
- D.
Six
- E.
Eight
Correct Answer
D. SixExplanation
The Calvin cycle is a series of chemical reactions that occur in the chloroplasts of plants during photosynthesis. It is responsible for converting carbon dioxide into glucose, a sugar molecule. In order to produce one molecule of glucose, the Calvin cycle must go through six complete cycles. Each cycle fixes one molecule of carbon dioxide, and after six cycles, six molecules of carbon dioxide have been fixed and combined to form one molecule of glucose. Therefore, the correct answer is six.Rate this question:
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- 42.
The process of breaking apart water is called
- A.
Photolysis
- B.
Hydrolysis
- C.
Photosynthesis
- D.
Osmosis
Correct Answer
A. pHotolysisExplanation
Photolysis is the correct answer because it refers to the process of breaking apart water molecules using light energy. During photolysis, water molecules are split into their components, hydrogen and oxygen, through the absorption of light energy, typically in the presence of chlorophyll. This process is an essential step in photosynthesis, where the released oxygen is used for respiration, and the hydrogen is utilized in the production of energy-rich molecules like ATP. Hydrolysis, on the other hand, refers to the breaking apart of molecules using water, while photosynthesis is the process by which plants convert light energy into chemical energy, and osmosis is the movement of water across a semipermeable membrane.Rate this question:
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- 43.
What products of the light dependent reactions are used in the light independent reactions?
- A.
ATP and Oxygen
- B.
Oxygen and Water
- C.
NADPH and ATP
- D.
Carbon Dioxide and Water
- E.
Electrons and Water
Correct Answer
C. NADpH and ATPExplanation
During the light-dependent reactions of photosynthesis, ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate) are produced. These products are then utilized in the light-independent reactions (also known as the Calvin cycle or dark reactions) to convert carbon dioxide into glucose. ATP provides the energy required for the synthesis of glucose, while NADPH donates high-energy electrons and hydrogen ions to convert carbon dioxide into glucose. Therefore, NADPH and ATP are the products of the light-dependent reactions that are used in the light-independent reactions.Rate this question:
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- 44.
What is a stack of thylakoids called?
- A.
Grana
- B.
Stroma
- C.
Chloroplasts
- D.
Mesophyll
- E.
Bundle Sheath
Correct Answer
A. GranaExplanation
A stack of thylakoids is called grana. Thylakoids are membrane-bound compartments found inside chloroplasts, which are responsible for photosynthesis in plants. These thylakoid membranes contain chlorophyll and other pigments that capture light energy. The grana are interconnected by stroma lamellae, which allow for the exchange of materials and energy between the thylakoids. The arrangement of the thylakoids in stacks increases the surface area available for light absorption, maximizing the efficiency of photosynthesis.Rate this question:
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- 45.
What molecule joins with carbon dioxide at the beginning of the Calvin Cycle?
- A.
RuBP
- B.
PGA
- C.
Glucose
- D.
ATP
- E.
NADPH
Correct Answer
A. RuBPExplanation
RuBP, or ribulose-1,5-bisphosphate, is the molecule that joins with carbon dioxide at the beginning of the Calvin Cycle. This molecule is essential for the fixation of carbon dioxide and the subsequent production of glucose. It acts as a substrate for the enzyme Rubisco, which catalyzes the reaction between carbon dioxide and RuBP to form an unstable intermediate molecule. This intermediate molecule then undergoes a series of reactions, ultimately leading to the synthesis of glucose and the regeneration of RuBP, allowing the cycle to continue.Rate this question:
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- 46.
What gas is given off by plants?
- A.
Carbon Dioxide
- B.
Oxygen
- C.
Nitrogen
- D.
Hydrogen
Correct Answer
B. OxygenExplanation
Plants undergo a process called photosynthesis, where they convert sunlight, water, and carbon dioxide into glucose and oxygen. During this process, oxygen is released as a byproduct and is given off by plants. This oxygen is essential for the survival of many organisms, including humans, as it is required for respiration. Therefore, the correct answer is oxygen.Rate this question:
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