Read the passage(s) below and answer the question on the basis of what is stated or implied in the passage(s) and in any introductory material that may be provided.
Passage
A turning leaf stays green at first, then reveals splotches of yellow and red as chlorophyll gradually breaks down. Dark green seems to stay longest in the veins, outlining and defining them. During the summer, chlorophyll breaks down in the heat and light, but it is also being steadily replaced. In the fall, on the other hand, no new pigment is produced, and so we notice the other colors that were always there, although chlorophyll's shocking green hid them from view. With their camouflage gone, we see these colors for the first time all year, and marvel, but they were always there, hidden like a vivid secret beneath the hot glowing greens of summer.
Adapted from Diane Ackerman, A Natural History of the Senses ©1990 Diane Ackerman.
According to the passage, which of the following most directly causes leaves to change their color in the fall?
- A. Chlorophyll in the leaves beginning to break down then
- B. Heat and light causing new pigments to be produced
- C. Existing pigments becoming more uniform
- D. New chlorophyll no longer being produced
Correct Answer & Rationale
Correct Answer: D
Leaves change color in the fall primarily due to the cessation of chlorophyll production. As chlorophyll breaks down and is not replaced, other pigments, such as carotenoids and anthocyanins, become more visible, leading to the vibrant autumn colors. Option A is misleading; while chlorophyll does break down, the key factor is that new chlorophyll is not produced. Option B incorrectly suggests that heat and light create new pigments, which is not the primary cause of color change. Option C is incorrect as it implies existing pigments become uniform rather than highlighting their visibility due to the lack of chlorophyll.
Leaves change color in the fall primarily due to the cessation of chlorophyll production. As chlorophyll breaks down and is not replaced, other pigments, such as carotenoids and anthocyanins, become more visible, leading to the vibrant autumn colors. Option A is misleading; while chlorophyll does break down, the key factor is that new chlorophyll is not produced. Option B incorrectly suggests that heat and light create new pigments, which is not the primary cause of color change. Option C is incorrect as it implies existing pigments become uniform rather than highlighting their visibility due to the lack of chlorophyll.
Other Related Questions
At the end of Passage 2. ('While... them'), the expert emphasizes
- A. function over form
- B. theory over practice
- C. ethics over ambition
- D. quality over quantity
Correct Answer & Rationale
Correct Answer: D
The emphasis on quality over quantity highlights the importance of substance in achieving meaningful results. Focusing on quality ensures that efforts lead to impactful outcomes, rather than merely increasing the number of tasks or projects. Option A, function over form, suggests prioritizing practicality, which is not the main point in this context. Option B, theory over practice, implies valuing ideas over action, contradicting the emphasis on tangible quality. Option C, ethics over ambition, shifts the focus to moral considerations rather than the value of high-quality efforts. Thus, the passage underscores the significance of quality in any endeavor.
The emphasis on quality over quantity highlights the importance of substance in achieving meaningful results. Focusing on quality ensures that efforts lead to impactful outcomes, rather than merely increasing the number of tasks or projects. Option A, function over form, suggests prioritizing practicality, which is not the main point in this context. Option B, theory over practice, implies valuing ideas over action, contradicting the emphasis on tangible quality. Option C, ethics over ambition, shifts the focus to moral considerations rather than the value of high-quality efforts. Thus, the passage underscores the significance of quality in any endeavor.
The main idea of the passage is that some types of poison frogs
- A. have developed the capacity to protect themselves from the poison they carry in their skin
- B. could eventually produce a natural pain relief option for people who suffer from headaches
- C. combine chemicals from their food to create a toxic substance that keeps them safe from predators
- D. can be grouped based on the changes they've made to their nicotinic acetylecholine receptors
Correct Answer & Rationale
Correct Answer: A
Option A highlights the unique adaptation of certain poison frogs, emphasizing their ability to protect themselves from their own toxins, which is central to understanding their survival strategy. Option B incorrectly suggests a potential medical application of the frogs' toxins, which is not the main focus of the passage. Option C mentions the frogs' use of dietary chemicals for defense, but does not address their self-protection mechanism, which is crucial to the main idea. Option D discusses a specific biological aspect of the frogs without linking it to their overall survival strategy, missing the broader context of the passage.
Option A highlights the unique adaptation of certain poison frogs, emphasizing their ability to protect themselves from their own toxins, which is central to understanding their survival strategy. Option B incorrectly suggests a potential medical application of the frogs' toxins, which is not the main focus of the passage. Option C mentions the frogs' use of dietary chemicals for defense, but does not address their self-protection mechanism, which is crucial to the main idea. Option D discusses a specific biological aspect of the frogs without linking it to their overall survival strategy, missing the broader context of the passage.
Which of the following, if true, would best serve to challenge Ogburn and Thomas's belief that the discovery of calculus is an example of the 'phenomenon' mentioned in the first sentence?
- A. Uncovering the existence of a journal that Newton kept while working with calculus
- B. Learning that scientists other than Newton and Leibniz had also made substantial progress on calculus
- C. Finding a previously unknown letter between Newton and Leibniz discussing calculus that predated its commonly assumed discovery
- D. Identifying a minor error in Newton's original mathematical calculations
Correct Answer & Rationale
Correct Answer: C
Option C effectively challenges Ogburn and Thomas's belief by suggesting that the discovery of calculus was not as isolated as previously thought. A letter between Newton and Leibniz predating the commonly accepted timeline implies prior knowledge or collaboration, undermining the notion of a singular 'phenomenon.' Option A, while interesting, does not directly challenge the notion of discovery but rather adds context to Newton's process. Option B highlights contributions from others but does not negate the significance of Newton and Leibniz’s roles. Option D points to an error that could suggest flaws in Newton's work but does not impact the legitimacy of the discovery itself.
Option C effectively challenges Ogburn and Thomas's belief by suggesting that the discovery of calculus was not as isolated as previously thought. A letter between Newton and Leibniz predating the commonly accepted timeline implies prior knowledge or collaboration, undermining the notion of a singular 'phenomenon.' Option A, while interesting, does not directly challenge the notion of discovery but rather adds context to Newton's process. Option B highlights contributions from others but does not negate the significance of Newton and Leibniz’s roles. Option D points to an error that could suggest flaws in Newton's work but does not impact the legitimacy of the discovery itself.
Which choice best characterizes the way the author presents the relationship between the arts and political and social issues?
- A. The arts are a key driver of political and social change.
- B. The arts are a way to distract people from political and social problems.
- C. The arts reflect changes in the political and social landscape,
- D. The arts are stifled during times of political and social upheaval
Correct Answer & Rationale
Correct Answer: C
The author illustrates that the arts serve as a mirror to society, effectively reflecting the evolving political and social landscape. This perspective highlights how artistic expression often responds to and encapsulates the sentiments of the times. Option A overstates the influence of the arts, suggesting they actively drive change rather than reflect it. Option B misrepresents the role of the arts, implying they serve only as distractions, which neglects their deeper societal relevance. Option D presents a limited view, focusing solely on suppression during upheaval, ignoring the arts' potential to comment on or critique such situations.
The author illustrates that the arts serve as a mirror to society, effectively reflecting the evolving political and social landscape. This perspective highlights how artistic expression often responds to and encapsulates the sentiments of the times. Option A overstates the influence of the arts, suggesting they actively drive change rather than reflect it. Option B misrepresents the role of the arts, implying they serve only as distractions, which neglects their deeper societal relevance. Option D presents a limited view, focusing solely on suppression during upheaval, ignoring the arts' potential to comment on or critique such situations.