Tüm alıştırma soruları

Deep-sea hydrothermal vents present an exceptionally harsh environment for marine life, characterized by extreme temperatures and toxic chemical concentrations. For decades, biologists struggled to understand how specialized organisms like tube worms could survive without access to sunlight for photosynthesis. Researchers eventually discovered that these organisms rely on a process called chemosynthesis. In this process, symbiotic bacteria living inside the tube worms convert the hydrothermal fluids' hydrogen sulfide into usable energy. This symbiotic relationship allows entire ecosystems to thrive in the dark ocean depths, successfully resolving the mystery of their survival.

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In astrophysics, the "lithium problem" refers to the discrepancy between the abundance of lithium-7 ($^7\text{Li}$) predicted by Big Bang nucleosynthesis (BBN) models and the much lower abundance actually observed in ancient, metal-poor stars. Some theorists suggest that this discrepancy is due to stellar depletion, where turbulent mixing transports surface lithium down into hot stellar interiors where it is destroyed. To evaluate this hypothesis, astrophysicist Elena Rossi measured the $^7\text{Li}$ abundance in a sample of ancient stars at various stages of stellar evolution. Rossi observed that despite having widely different internal temperatures and mixing rates, all the stars in the sample displayed nearly identical, uniformly low $^7\text{Li}$ abundances. Which choice most logically completes the text?

For decades, forest ecologists have sought to explain "crown shyness," a phenomenon in which the uppermost branches of neighboring trees do not touch, creating canopy channels. Some researchers hypothesized that this spacing is a passive result of physical abrasion: wind causes branches to collide and break, pruning the edges. Recently, a team led by biologist Miriama Toro tested this hypothesis by measuring canopy structures in wind-sheltered valleys compared to exposed ridges. They observed that even in wind-shielded environments, trees maintained distinct gaps between their crowns. These findings strongly suggest that crown shyness is not merely mechanical wear, but rather an active, light-sensing growth response that optimizes resource acquisition.

Which choice best describes the overall structure of the text?

While historians often credit the rise of vernacular languages in early modern Europe to a sudden flowering of national consciousness, the standardization of these languages was largely a byproduct of commercial logistics. In the decades following the invention of the printing press, printers faced a highly fragmented market of localized dialects. To maximize profits and minimize production costs, printing cartels selected regional dialects that possessed the widest potential readership and codified them through dictionaries and style guides. Consequently, the consolidation of national languages was not primarily an ideological project driven by state institutions or literary movements, but rather a pragmatic solution to the economic constraints of mass-producing text.

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Although early botanical hypotheses attributed 'crown shyness'—the gap-like spacing between adjacent tree canopies—solely to mechanical abrasion caused by wind-driven collisions, recent research suggests a more complex, multi-causal origin. Biologists have found that some species actively cease lateral growth upon detecting far-red light reflected from neighboring leaves, a photoreceptor-mediated response that avoids wasteful leaf production in shaded zones. Furthermore, these gaps may serve as natural barriers that limit the spread of herbivorous insects and light-sensitive pathogens. Thus, rather than being a passive consequence of physical damage, canopy gaps represent an adaptive, physiologically regulated optimization of light capture and forest health.

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Traditionally, ecologists viewed competition as the primary force shaping plant community structures in harsh environments. However, in the late 1990s, researchers began documenting positive interactions, or facilitation, where one species buffers another from physical stress. For instance, nurse plants shade seedlings from scorching heat, enhancing survival rates. While early facilitation research was dismissed as anecdotal, subsequent large-scale meta-analyses confirmed its ubiquity across diverse biomes. Consequently, contemporary ecological models increasingly integrate both competitive and facilitative dynamics to predict community responses to climate change, representing a paradigm shift in the field.

Which choice best describes the overall structure of the text?

Ecologist Dr. Liam O'Connor investigated the nesting habits of eastern bluebirds (*Sialia sialis*) in suburban parks. O'Connor hypothesized that eastern bluebirds prefer to build nests in artificial nest boxes rather than natural tree cavities when both options are available in the same territory. To test this hypothesis, O'Connor's team monitored several parks where equal numbers of suitable natural tree cavities and artificial nest boxes were present during the breeding season. Which choice, if true, would most directly support Dr. O'Connor's hypothesis?

Literary scholar Dr. Samuel Kojo investigated the societal reach of early twentieth-century West African newspapers written in local languages, such as the Yoruba-language weekly *Eko Akete*. Some historians have argued that because literacy rates were low during this period, these publications had a negligible impact on the wider public and were read almost exclusively by a small, bilingual elite. Kojo, however, contends that the newspapers reached a far broader audience than circulation and literacy statistics suggest. He hypothesizes that literate individuals frequently read the newspapers aloud to groups of non-literate community members in public settings. Which choice, if true, would most directly support Kojo's hypothesis?

Cognitive offloading—the physical externalization of cognitive tasks, such as writing down a list or using a calculator—is often characterized as a compromise that reduces mental effort at the expense of long-term memory retention. However, a study by psychologist Dr. Evan Vance suggests that this view is incomplete. Vance and his team demonstrated that when participants offloaded a primary memory task to a digital interface, their cognitive capacity was freed up, enabling them to perform significantly better on subsequent, unrelated tasks that required creative problem-solving. Thus, rather than simply diminishing cognitive engagement, offloading can function as a strategic tool that optimizes overall mental performance.

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In 1964, astronomers Arno Penzias and Robert Wilson detected a persistent background noise using their horn antenna at Bell Laboratories. Initially, they suspected the interference came from terrestrial sources, urban radio interference, or even pigeon droppings inside the antenna itself. However, after systematically cleaning the instrument and eliminating all possible local disturbances, the hum remained. Parallel to their efforts, physicists at Princeton University were theorizing that the universe's creation would have left a faint, uniform thermal radiation throughout space. When Penzias and Wilson shared their findings with the Princeton team, they realized the noise was actually the cosmic microwave background radiation—the relic radiation from the Big Bang. This accidental detection provided crucial observational evidence for the Big Bang theory, transforming modern cosmology.

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Many historians of technology argue that the widespread adoption of the printing press in fifteenth-century Europe did not immediately democratize knowledge, pointing to the persistent high cost of paper and low literacy rates. However, historian Elena Vance argues that focusing solely on direct literacy overlooks the secondary pathways through which print transformed society. She notes that even illiterate individuals frequently gathered in public squares to hear printed pamphlets read aloud by local officials. Consequently, Vance contends that the early print revolution's social reach should be measured by acoustic transmission rather than individual reading capabilities. This framework suggests that the impact of new media is often structural rather than personal, altering collective communication habits before it changes individual skills.

Which choice best describes the function of the underlined sentence in the text as a whole?

In a study of historical linguistics, researcher Dr. Sophia Patel investigated the transmission of agricultural vocabulary among prehistoric communities in the Fertile Crescent. Patel hypothesized that the adoption of farming terms by local hunter-gatherer groups was primarily driven by trade relationships with neighboring agriculturalists, rather than by the physical migration and displacement of hunter-gatherers by farming populations. To evaluate this hypothesis, Patel examined phonetic and grammatical patterns in reconstructed dialects of both groups from the period of early agricultural expansion. Which choice, if true, would most directly support Patel's hypothesis?

In a 2025 analysis of the Cretan Hieroglyphic script, epigraphist Dr. Elena Rostova examined the positional distribution of the 'medallion' glyph (designated Sign 038) across clay administrative documents from the Knossos palace archives. Rostova documented that Sign 038 is entirely absent from two-sided medallions, appearing instead only on three-sided clay bar documents containing agricultural inventories. Within these inventories, the glyph is invariably positioned immediately prior to numerical tallies representing barley yields, while remaining absent from passages recording olive oil distributions. Based on these positional patterns, Rostova argues that Sign 038 functioned as a logogram designating raw grain commodities rather than denoting a broad transaction category.

Based on the text, which statement is true about the 'medallion' glyph (Sign 038)?

Many plant species possess extrafloral nectaries—glands located outside the flowers that secrete a sugar-rich fluid. While floral nectaries function primarily to attract pollinators, evolutionary biologists initially assumed extrafloral nectaries served a similar direct reproductive role by distracting foliage-eating insects. However, ecologist Elizabeth Schuyler's research reveals a mutualistic defense mechanism: the nectar specifically recruits predatory ants, which patrol the plant and aggressively repel herbivores. Thus, rather than acting as a passive decoy to divert pests, extrafloral nectaries function as an active recruitment system that secures biotic protection, demonstrating that plant defense strategies can rely on the behavioral manipulation of mutualist partners.

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In her study of historical documents, sociologist Clara Ruiz warns against treating archives as objective, transparent records of the past. Instead, she argues that archival collections are inevitably ________, reflecting the specific biases, omissions, and political priorities of the institutions and individuals who assembled them.

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Prior to the 1977 discovery of deep-sea hydrothermal vents, scientists believed that all marine ecosystems ultimately depended on sunlight for energy, with photosynthesis forming the base of every food chain. However, researchers exploring the Galápagos Rift found diverse communities of crabs, clams, and giant tube worms thriving in total darkness near these volcanic vents. Instead of utilizing sunlight, specialized bacteria in these environments convert toxic chemicals from the vents into usable energy through chemosynthesis. This discovery proved that life can flourish in extreme environments entirely independent of solar energy, expanding our understanding of the conditions necessary to sustain life.

Which choice best states the main idea of the text?

In evolutionary biology, the concept of 'niche construction' describes how organisms modify their environments, thereby altering the evolutionary pressures they face. While some researchers characterize these environmental alterations as ________—incidental byproducts of an organism's daily activities—others argue that they represent active, inherited behaviors shaped specifically by natural selection to enhance survival.

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

Linguists long hypothesized that geographic isolation acts as a conservative force, preserving a language's ancestral phonology by shielding it from contact-induced change. To test this, researcher Maya Lin analyzed several phonological structures in the highly isolated Pamir languages of Central Asia. Lin discovered that although these languages retained archaic vowel systems, they also exhibited rapid, systemic lenition (softening of consonant sounds). Because this consonant lenition arose from internal articulatory simplification rather than contact with neighboring languages, Lin concluded that geographic isolation, while preventing external linguistic borrowing, _______

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