Le Hw4.1.13
These questions deal with guard cells, stomata, and photosynthesis.
REMEMBER: period # followed by first & last name.
you must score at least a 70.
Questions and Answers
- 1.
The diagram below represents a cross section of part of a leaf. Which life functions are directly regulated through feedback mechanisms associated with the actions of the structures labeled X?
- A.
Excretion and immunity
- B.
Digestion and coordination
- C.
Circulation and reproduction
- D.
Respiration and photosynthesis
Correct Answer
D. Respiration and photosynthesisExplanation
The structures labeled X in the diagram are most likely the stomata, which are responsible for gas exchange in plants. Stomata regulate the process of respiration, allowing for the exchange of oxygen and carbon dioxide. They also play a crucial role in photosynthesis, as they allow for the intake of carbon dioxide needed for the process. Therefore, the correct answer is respiration and photosynthesis.Rate this question:
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- 2.
The graph below shows photosynthetic activity in an ecosystem over a 24-hour period. Data for a study on respiration in this ecosystem should be collected during
- A.
Interval A, from only the producers in the ecosystem
- B.
Intervals A and B, from only the consumers in the ecosystem
- C.
Intervals A and B, from both the producers and consumers in the ecosystem
- D.
Interval A only, from abiotic but not biotic components of the ecosystem
Correct Answer
C. Intervals A and B, from both the producers and consumers in the ecosystemExplanation
The correct answer is intervals A and B, from both the producers and consumers in the ecosystem. This is because respiration occurs in both producers (plants) and consumers (animals) in an ecosystem. By collecting data during intervals A and B, which cover a 24-hour period, researchers can observe the respiration rates of both producers and consumers and gain a comprehensive understanding of the ecosystem's respiration activity.Rate this question:
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- 3.
Maple trees and tulips are classified as autotrophs because they both
- A.
Produce gametes by the process of mitosis
- B.
Produce carbon dioxide and water as metabolic wastes
- C.
Are able to obtain complex organic materials from the environment
- D.
Are able to synthesize organic molecules from inorganic raw materials
Correct Answer
D. Are able to synthesize organic molecules from inorganic raw materialsExplanation
Maple trees and tulips are classified as autotrophs because they are able to synthesize organic molecules from inorganic raw materials. Autotrophs are organisms that can produce their own food using energy from sunlight or inorganic compounds. They do this through a process called photosynthesis, where they convert carbon dioxide and water into glucose and oxygen. This ability to create organic molecules from inorganic sources is what distinguishes autotrophs from heterotrophs, which rely on consuming organic matter for their energy.Rate this question:
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- 4.
The diagram below represents a plant cell. Which process takes place in structure A?
- A.
Cellular respiration
- B.
Heterotrophic nutrition
- C.
Digestion of fats
- D.
Protein synthesis
Correct Answer
A. Cellular respirationExplanation
Structure A in the plant cell diagram represents the mitochondria, which is the site of cellular respiration. Cellular respiration is the process by which cells convert glucose and oxygen into energy in the form of ATP. This process occurs in the mitochondria of both plant and animal cells. Therefore, the correct answer is cellular respiration.Rate this question:
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- 5.
The diagram below represents a process that occurs in a structure of a specialized cell. Which group below correctly identifies the letters in the diagram?
- A.
A: ribososme B: oxygen C: carbon dioxide D: water
- B.
A: mitochondrion B: water C: oxygen D: protein
- C.
A: nucleus B: nitrogen C: carbon D: starch
- D.
A: chloroplast B: carbon dioxide C: water D: glucose
Correct Answer
D. A: chloroplast B: carbon dioxide C: water D: glucose -
- 6.
The diagram below represents a cross section of a leaf of a green plant, showing an opening (stomate) in the lower surface. A stomate in the lower surface of the leaf has a function most similar to the function of which cell structure?
- A.
Cell membrane
- B.
Vacuole
- C.
Ribosome
- D.
Nucleus
Correct Answer
A. Cell membraneExplanation
The stomate in the lower surface of the leaf functions similarly to the cell membrane. The cell membrane controls the movement of substances in and out of the cell, just like the stomate controls the exchange of gases (such as oxygen and carbon dioxide) in and out of the leaf. Both structures play a crucial role in regulating the internal environment of the cell or leaf.Rate this question:
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- 7.
A biological process that occurs in plants is represented below. Which group identifies the lettered substances in this process?
- A.
A: enzymes B: oxygen C: carbon dioxide D: glucose
- B.
A: carbon dioxide B: glucose C: oxygen D: enzymes
- C.
A: glucose B: enzymes C: oxygen D: carbon dioxide
- D.
A: oxygen B: glucose C: carbon dioxide D: enzymes
Correct Answer
B. A: carbon dioxide B: glucose C: oxygen D: enzymesExplanation
The correct answer is A: carbon dioxide, B: glucose, C: oxygen, D: enzymes. This group correctly identifies the substances involved in the biological process in plants. Carbon dioxide is taken in by plants during photosynthesis, glucose is produced as a result of photosynthesis, oxygen is released as a byproduct of photosynthesis, and enzymes are involved in catalyzing the reactions of photosynthesis.Rate this question:
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- 8.
The diagram below represents an autotrophic cell. For the process of autotrophic nutrition, the arrow labeled A would most likely represent the direction of movement of
- A.
Carbon dioxide, water, and solar energy
- B.
Oxygen, glucose, and solar energy
- C.
Carbon dioxide, oxygen, and heat energy
- D.
Glucose, water, and heat energy
Correct Answer
A. Carbon dioxide, water, and solar energyExplanation
The diagram represents an autotrophic cell, which means it is capable of producing its own food through photosynthesis. In photosynthesis, carbon dioxide and water are converted into glucose and oxygen, using solar energy. Therefore, the arrow labeled A would most likely represent the direction of movement of carbon dioxide, water, and solar energy, as these are the substances involved in the process of autotrophic nutrition.Rate this question:
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- 9.
Base your answer on the information below and on your knowledge of biology. The Control of Transpiration Plants normally lose water from openings (stomates) in their leaves. The water loss typically occurs during daylight hours when plants are exposed to the Sun. This water loss, known as transpiration, is both beneficial and harmful to plants. Scientists believe wind and high temperatures increase the rate of transpiration, but the size of each stomate opening can be regulated. Reducing the size of the openings during drought conditions may help reduce the dehydration and wilting that would otherwise occur. A leaf may lose more than its own weight in water each day. Transpiration also lowers the internal temperature of the leaf as water evaporates. On hot days, temperatures in the leaves may be from 3° to 15°C cooler than the outside air. With stomates open, vital gases may be exchanged between the leaf tissues and the outside environment. Researchers have also found many plants that use another response when leaf temperatures rise. Special molecules known as heat shock proteins are produced by plant cells and help to hold enzymes in their functional shapes. Identify one of the “vital gases” that are exchanged between leaf tissues and the outside environment. [1]
Correct Answer
carbon dioxide
oxygen
CO2
O2
water
water vaporExplanation
Plants exchange carbon dioxide (CO2) and oxygen (O2) with the outside environment through the stomates in their leaves. These gases are vital for the process of photosynthesis, where plants convert carbon dioxide into oxygen and glucose. Additionally, water vapor is also exchanged, as transpiration involves the evaporation of water from the leaves.Rate this question:
- 10.
Base your answer on the information below and on your knowledge of biology. The Control of Transpiration Plants normally lose water from openings (stomates) in their leaves. The water loss typically occurs during daylight hours when plants are exposed to the Sun. This water loss, known as transpiration, is both beneficial and harmful to plants. Scientists believe wind and high temperatures increase the rate of transpiration, but the size of each stomate opening can be regulated. Reducing the size of the openings during drought conditions may help reduce the dehydration and wilting that would otherwise occur. A leaf may lose more than its own weight in water each day. Transpiration also lowers the internal temperature of the leaf as water evaporates. On hot days, temperatures in the leaves may be from 3° to 15°C cooler than the outside air. With stomates open, vital gases may be exchanged between the leaf tissues and the outside environment. Researchers have also found many plants that use another response when leaf temperatures rise. Special molecules known as heat shock proteins are produced by plant cells and help to hold enzymes in their functional shapes. Identify the specific leaf structures that regulate the opening and closing of stomates. [1]
Correct Answer
guard cells
guard cellExplanation
Guard cells are the specific leaf structures that regulate the opening and closing of stomates. These cells are found in the epidermis of leaves and control the size of the stomatal openings. When the guard cells are turgid, they swell and cause the stomates to open, allowing for gas exchange and transpiration. When the guard cells lose water and become flaccid, they shrink and close the stomates, reducing water loss. This regulation of stomatal openings helps plants balance the need for gas exchange with the need to conserve water, especially during drought conditions.Rate this question:
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Mar 21, 2023Quiz Edited by
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Nov 20, 2011Quiz Created by
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