All practice questions

For much of the twentieth century, forest management policies in the western United States prioritized the immediate suppression of all wildfires. However, ecologists have since determined that this practice has inadvertently threatened the giant sequoia (*Sequoiadendron giganteum*). Giant sequoias possess thick, fire-resistant bark and rely on low-intensity forest fires to clear competing undergrowth, which creates nutrient-rich soil and allows sunlight to reach seedlings. Furthermore, the intense heat from these fires is required to open the trees' tightly closed cones, facilitating seed dispersal. By preventing these natural fire cycles, suppression efforts have hindered the reproduction of giant sequoias and allowed shade-tolerant trees to crowd out new growth, demonstrating that periodic fire is essential for the long-term survival of the sequoia ecosystem.

Which choice best states the main idea of the text?

Urban heat islands present a significant environmental challenge, as concrete surfaces absorb solar radiation and raise city temperatures. To address this issue, urban planners are increasingly implementing green roofs—vegetated layers grown on rooftops. These green roofs act as natural insulators, cooling buildings and reducing the surrounding air temperature through evapotranspiration. Early studies in Chicago confirm that wide-scale adoption of vegetated roofs can lower citywide temperatures by up to two degrees Celsius. Consequently, many municipalities are now offering tax incentives to encourage property owners to install green roofs.

Which choice best describes the overall structure of the text?

While many contemporary critics praised the author’s latest novel for its stylistic innovation, some reviewers felt the need to ________ their endorsement. They noted that while the book's narrative structure was indeed pioneering, the plot ultimately relied on familiar, clichéd tropes that undermined its overall impact.

Which choice completes the text with the most logical and precise word or phrase?

For decades, planetary scientists debated the primary origin of Earth’s surface water, generally favoring the 'late veneer' hypothesis, which posits that water-rich asteroids bombarded the planet post-formation. Recently, however, geochemical analyses of deep-mantle rocks have challenged this consensus by revealing isotopic signatures identical to those of ancient nebular dust. These findings suggest that water was actually present during Earth's initial accretion, locked within the planetary interior and later released through volcanic degassing. While some researchers argue that both mechanisms contributed significantly, the discovery of early mantle water has fundamentally shifted focus toward internal geological processes rather than external cosmic impacts.

Which choice best describes the overall structure of the text?

Biologist Dr. Sarah Jenkins and her team investigated the impact of artificial light at night (ALAN) on the foraging behavior of the Eastern pipistrelle (*Perimyotis subflavus*), a species of insectivorous bat. Jenkins hypothesized that while ALAN increases the local concentration of insects around streetlights, it actually reduces the overall foraging efficiency of the bats by making them more visible to predators like owls, forcing them to spend more time in sheltered, darker areas of the forest canopy instead of hunting in the open.

Which finding from Jenkins's study, if true, would most directly support her hypothesis?

In a study of the cooperatively breeding cichlid fish *Neolamprologus pulcher*, evolutionary biologist Dr. Marcus Vance investigated the "pay-to-stay" hypothesis. This hypothesis suggests that subordinate helpers assist in territory defense and offspring care not solely due to kin selection, but as a form of "rent" to prevent dominant breeders from expelling them from the safety of the territory. Vance argued that if helping is indeed a transaction to secure territory residency, dominant breeders should respond to a helper's temporary inactivity with increased social policing (aggression) only when resources are scarce, as the cost of hosting a non-productive helper is higher under these conditions.

Which finding, if true, would most directly support Vance's argument?

Historically, urban planning prioritized noise mitigation, treating city sounds purely as pollutants to be suppressed. However, acoustic ecologist Dr. Elena Vance argues that this subtractive approach ignores the psychological benefits of constructive soundscapes. Vance's recent study map-analyzed resident stress levels across three European cities, demonstrating that introducing natural acoustic markers—like flowing water or rustling leaves—alleviated urban fatigue more effectively than erecting physical noise barriers. Critics argue that Vance's model fails to account for varying cultural perceptions of specific sounds, claiming some communities might find water features agitating. Nevertheless, Vance asserts that incorporating deliberate, positive auditory design remains a vital next step for modern sustainable architecture.

Which choice best describes the overall structure of the text?

Many animal species adapt their communication strategies to survive in human-altered environments. Biologist Dr. Marcus Thorne hypothesized that urban noise pollution causes city-dwelling house finches (*Haemorhous mexicanus*) to sing at a higher minimum frequency than rural house finches to prevent their songs from being masked by low-frequency traffic noise.

Which finding, if true, would most directly support Dr. Thorne's hypothesis?

Traditional Japanese *machiya* (wooden townhouses) are characterized by their narrow street facades and deep interior layouts. To address the challenge of stagnant air and heat during humid summers, these structures historically incorporated *tsuboniwa*—small, open-air courtyards situated deep within the building. Climatologist Dr. Kenji Sato hypothesized that the primary function of the *tsuboniwa* is to act as a passive cooling system. According to Sato, the temperature differential between the shaded, vegetation-filled courtyard and the warmer, street-facing rooms generates a convective air current that draws cooler air from the courtyard through the house's interior. Which choice, if true, would most directly support Sato's hypothesis?

For centuries, economists asserted that money emerged naturally to resolve the inefficiencies of barter, wherein individuals struggled to find trade partners with matching needs. Anthropological evidence, however, challenges this foundational narrative. Researchers like Caroline Humphrey have noted that no historical society has ever been documented operating a pure barter economy. Instead, early community transactions were sustained by dense networks of social credit and gift-exchange, where goods were shared with the implicit understanding of future reciprocity. Money did not arise to simplify spot transactions between strangers; rather, it was introduced much later, often by centralized authorities seeking to standardize debt obligations and facilitate taxation.

Which choice best states the main idea of the text?

In the late twentieth century, evolutionary biologists typically characterized phenotypic plasticity—the ability of an organism to alter its physical traits in response to environmental changes—as a temporary, non-heritable buffer against environmental stress. Recent research on marine snails, however, suggests that these environmentally induced modifications can stabilize over generations, driving long-term evolutionary adaptation even in the absence of initial genetic mutations. Consequently, plasticity is increasingly viewed not merely as a passive shield against selection pressures, but as an active mechanism that can direct the evolutionary trajectory of a species.

Which choice best states the main idea of the text?

Seagrass meadows are vital marine ecosystems, but they are rapidly declining worldwide due to coastal development and pollution. In response to this ecological crisis, conservationists have historically relied on transplanting mature seagrass shoots from healthy beds, a method that often damages the donor sites. Recently, however, marine biologist Dr. Elena Vance proposed a novel restoration technique: using biodegradable mesh mats embedded with seagrass seeds. Vance's team tested these mats in degraded bays and found that they successfully stabilized the seafloor and allowed new shoots to propagate without harming existing meadows, offering a promising, low-impact solution for marine restoration.

Which choice best describes the overall structure of the text?

In his seminal 1973 study of economic activity in urban Ghana, anthropologist Keith Hart coined the term "informal sector" to describe the myriad economic activities of migrants that existed outside the purview of state regulation and formal employment. Traditional development economists of the era conceptualized these informal practices as transient anomalies—mere developmental lags destined to be absorbed by a modernizing formal economy. Hart, however, argued that this sector was not a passive residue of underdevelopment, but rather a highly organized, autonomous system of self-employment driven by its own internal rationality and social networks. Far from being a temporary stepping stone toward modernization, the informal economy functioned as a permanent, structurally vital component of urban livelihood that actively compensated for the state's failure to provide wage labor.

Which choice best states the main idea of the text?

In many forest ecosystems, underground networks of mycorrhizal fungi form symbiotic relationships with trees. By transferring water and nutrients directly to tree roots, these networks ________ the growth of the trees, allowing them to thrive even in nutrient-poor soils.

Which choice completes the text with the most logical and precise word or phrase?

Which choice completes the text with the most logical and precise word or phrase?

Although the nineteenth-century painter Albert Bierstadt was celebrated for his grand, sweeping landscapes of the American West, some contemporary critics viewed his dramatic lighting effects as a _______ attempt to sensationalize the frontier. These critics argued that such idealized depictions distorted the reality of the western environment for commercial gain.

Which choice completes the text with the most logical and precise word?

Although the Venus flytrap (*Dionaea muscipula*) is famous for capturing and digesting insects, it does not obtain energy from these prey in the way that animals do. Instead, the plant uses photosynthesis to produce its own sugars for energy, just like other plants. The Venus flytrap consumes insects primarily to acquire essential nutrients, particularly nitrogen, which are severely lacking in the acidic, nutrient-poor soils of its natural wetland habitat. Therefore, the traps are an adaptation for nutrient absorption rather than a substitute for photosynthesis.

Which choice best states the main idea of the text?

Determine the most logical and precise word to complete the text.

In the hyper-arid, frigid desert of Antarctica's McMurdo Dry Valleys, visible life on rock surfaces is virtually non-existent. Instead, microbial life, dominated by endolithic lichens, colonizes the pore spaces just millimeters beneath the surface of translucent sandstones. Rather than merely surviving in a dormant state, these organisms actively drive physical and chemical weathering processes. By executing cyclic expansion during brief hydration periods and producing oxalic acid, they gradually dissolve cement minerals, causing the sandstone to flake off. While researchers initially theorized that these micro-ecosystems were static relics of past milder climates, recent metabolic monitoring confirms that they function as active, albeit slow, geomorphological agents that continuously reshape the local landscape.

Which choice best states the main idea of the text?

In his analysis of late-nineteenth-century urban planning, historian Marcus Vance argues that the creation of public parks was not a purely altruistic endeavor designed to improve public health. Instead, Vance suggests that municipal leaders viewed parks as a ______ tool of social management, subtly steering the leisure activities of the working class toward behaviors deemed acceptable by the elite.

Which choice completes the text with the most logical and precise word?