Tüm alıştırma soruları

Read the passage below:

I clutched the leather-bound promptbook, my knuckles white under the dim blue worklights of the wings. For six grueling months, this drafty stage had been my battleground, a place where I fought every afternoon to coax a masterpiece from a reluctant cast. Now, as the gold velvet curtain slowly parted, I was reduced to a silent ghost in the shadows, entirely helpless to intervene.

On stage, Clara stood frozen in the center spotlight, shivering despite the intense heat radiating from the lamps. She felt the heavy velvet of her costume pressing against her collarbone like lead, her mind racing as she wondered if she would remember the opening line that had completely eluded her during yesterday's dress rehearsal. Her fingers trembled against her skirt.

Below them, in the cavernous darkness of the auditorium, five hundred spectators held their breath in unison. None of them were aware of the fraying rope above the proscenium arch, nor could they sense the director’s quiet panic in the wings. They were simply a single, collective entity, waiting with suspended judgment to be transported to another world.

Based on the passage, match each excerpt with the specific narrative point of view it represents.

A student designs an experiment to test how different concentrations of salt water affect the germination rate of radish seeds. The student places 50 radish seeds in each of four petri dishes. Each dish is watered with a different concentration of salt solution ($0\%$, $1\%$, $2\%$, and $3\%$ salt). All petri dishes are kept in the same incubator at a constant temperature of $22^\circ\text{C}$ and receive 12 hours of light daily. After 5 days, the student counts the total number of germinated seeds in each dish. Match each experimental component on the left with its correct variable classification on the right.

A group of students designed an experiment to investigate the factors that influence the corrosion (rusting) of iron. Identical iron nails were placed in 5 different test tubes under the conditions described below:

* Tube 1: Nail fully submerged in $10\text{ mL}$ of distilled water, with a layer of mineral oil on top to prevent contact with atmospheric oxygen.
* Tube 2: Nail exposed to ambient air only (no liquid).
* Tube 3: Nail fully submerged in $10\text{ mL}$ of distilled water exposed to ambient air.
* Tube 4: Nail fully submerged in $10\text{ mL}$ of a $3\%\text{ NaCl}$ (salt) solution exposed to ambient air.
* Tube 5: Nail fully submerged in $10\text{ mL}$ of a $5\%$ acetic acid (vinegar) solution exposed to ambient air.

Match each test tube to its specific role in the experimental design.

Researchers investigated the effect of light wavelength on the photosynthetic rate of *Elodea* plants. Over a 24-hour period, three identical setups were maintained at a constant temperature of $22^\circ\text{C}$ and exposed to different colors of light (red, blue, or green). The rate of photosynthesis was determined by measuring the volume of oxygen gas produced by the plants in milliliters.

Match each component of the experiment to the correct variable type it represents.

Passage

For billions of years, Mars has transitioned from a warm, wet world with a thick atmosphere to the cold, dry desert we see today. In 2014, NASA’s MAVEN (Mars Atmosphere and Volatile EvolutioN) spacecraft entered orbit to investigate the mechanisms driving this transition. Specifically, researchers hypothesized that the solar wind—a stream of charged particles constantly emitted by the Sun—was responsible for stripping away the Martian atmosphere.

MAVEN's instruments measured the rate of atmospheric ion loss under different solar conditions. During solar storms, such as coronal mass ejections, the rate of ion escape into space increased by a factor of more than ten. Furthermore, MAVEN detected a magnetic 'tail' stretching behind Mars, where solar magnetic field lines drape around the planet and accelerate ions outward. These observations demonstrate that solar activity actively drives the depletion of Mars’s light gases. While some scientists previously argued that internal planetary cooling and the subsequent loss of Mars's global magnetic field were the primary drivers of atmospheric escape, MAVEN's real-time data shows that external solar wind interactions remain the dominant force in the ongoing stripping of the Martian atmosphere.

Question
Match each of the scientific claims on the left with the specific textual evidence on the right that provides direct supporting evidence.

A science class designed four different experiments to study the effects of various independent variables. Match each experimental setup with the correct control group or baseline condition required to validate the results.

Three scientists discuss the primary cause of a global cooling event that occurred millions of years ago.

Scientist 1
The cooling was caused by volcanic eruptions. Volcanic dust and sulfur dioxide gas ($SO_2$) were injected into the stratosphere. These aerosols reflected incoming solar radiation back into space, reducing global surface temperatures. The cooling caused a rapid growth in polar ice sheets, which increased the Earth's albedo (reflectivity) and led to further cooling.

Scientist 2
The cooling was caused by the rapid expansion of early forests. The growth of these plants absorbed large amounts of carbon dioxide ($CO_2$) from the atmosphere through photosynthesis. The reduction of this greenhouse gas decreased the atmosphere's ability to retain heat, leading to global cooling. Ocean temperatures dropped, which increased the amount of $CO_2$ that dissolved in the oceans, further lowering atmospheric levels.

Scientist 3
The cooling was caused by a large asteroid impact. The impact blasted massive quantities of pulverized rock and dust into the upper atmosphere, blocking sunlight for several years. This dust layer reflected solar radiation, preventing it from warming the surface. The lack of sunlight caused widespread plant die-offs and triggered a long-term cooling cycle as snow cover expanded.

Match each of the following statements with the specific scientists who would agree with that statement.

Two models are proposed to explain how a certain species of lizard changes its color between green and brown.

* Model 1: The color change is regulated solely by ambient temperature. At low temperatures (below $20^\circ\text{C}$), the lizards turn brown to absorb heat. At high temperatures (above $30^\circ\text{C}$), they turn green to reflect solar radiation.
* Model 2: The color change is regulated solely by background color. When on a brown background, the lizards turn brown for camouflage. When on a green background, they turn green.

Match each new experimental finding on the left to its relationship with Model 1 and Model 2 on the right.

Three researchers propose conflicting explanations for the Mpemba effect (the observation that warmer water can sometimes freeze faster than colder water).

Researcher 1
The effect is primarily driven by mass loss and cooling due to evaporation. Warmer water evaporates much more rapidly than colder water, which reduces the total mass of the water sample that must be cooled and carries away a significant amount of heat (latent heat of vaporization). This mechanism requires that the container is open to the atmosphere.

Researcher 2
The effect is primarily caused by the expulsion of dissolved gases. Heating water decreases the solubility of dissolved gases (such as $O_2$ and $CO_2$), causing them to escape. Water with lower gas concentrations has higher thermal conductivity and higher convection rates, accelerating cooling. This mechanism assumes that heating alters the physical and chemical state of the water prior to cooling.

Researcher 3
The effect is driven by changes in hydrogen bonding. In warm water, stretched hydrogen bonds force the covalent $O-H$ bonds to contract and store energy. As the water cools, these bonds relax and release energy, accelerating heat transfer out of the system. This molecular mechanism does not depend on mass loss or gas expulsion, meaning the effect can occur in completely sealed containers.

Match each of the described experimental scenarios or observations to the researcher(s) whose model predicts or is supported by that outcome.

### Passages: Origin of Hot Jupiters

Astronomers have proposed three models to explain the existence of "hot Jupiters"—giant planets with orbital periods of less than 10 days that orbit very close to their host stars.

Model 1 (In-situ Formation)
Giant planets form at their current close-in locations ($< 0.1 \text{ AU}$ from the host star). Protoplanetary disks under certain conditions can concentrate high densities of rocky and icy grains in the inner disk. This local concentration allows a solid core of approximately $10$ Earth masses ($M_{\oplus}$) to accumulate rapidly. Once the core forms, it quickly accretes gas from the surrounding disk before the disk dissipates (typically within 10 million years).

Model 2 (Disk Migration)
Giant planets cannot form close to their host stars because the high temperatures and intense stellar winds prevent the accumulation of volatile gases. Instead, they form in the outer disk ($> 5 \text{ AU}$) where volatile materials are abundant. As the planet orbits, it exerts gravitational forces on the surrounding gaseous disk, creating spiral density waves. These waves exert a net torque on the planet, causing its orbit to shrink. The planet spirals inward toward the star (Type II migration) over 1 to 5 million years, maintaining a circular orbit that remains aligned with the star's equator.

Model 3 (High-Eccentricity Tidal Migration)
Giant planets form in the cold outer disk ($> 5 \text{ AU}$). Gravitational perturbations from a distant companion star or another massive planet disrupt the giant planet's orbit, forcing it into a highly eccentric (non-circular) and highly inclined orbit. During periastron passage (closest approach to the host star), the star's strong gravity raises tidal bulges on the planet. The tidal friction converts orbital energy into thermal energy within the planet, causing the orbit to gradually shrink and circularize over hundreds of millions of years, long after the protoplanetary gas disk has dissipated.

### Matching Task
Match each new experimental finding on the left to its correct implication for the models on the right.

### Passage

The Paleocene-Eocene Thermal Maximum (PETM) Carbon Excursion

Approximately 56 million years ago, Earth experienced the Paleocene-Eocene Thermal Maximum (PETM), characterized by a rapid global temperature rise of $5^\circ\text{C}$ to $8^\circ\text{C}$ and a massive negative carbon isotope excursion (CIE), indicating a large injection of light carbon ($^{12}\text{C}$-enriched) into the ocean-atmosphere system. Three hypotheses propose different primary mechanisms for this event.

*Hypothesis 1 (Methane Hydrate Dissociation)*
Initial gradual warming, triggered by orbital variations and volcanic outgassing, warmed deep ocean currents. This warming destabilized submarine methane hydrates ($CH_4 \cdot H_2O$) trapped in continental slope sediments. The sudden release of oceanic methane ($CH_4$), which has an extremely light isotopic signature ($\delta^{13}\text{C} \approx -60\text{‰}$), led to rapid oxidation in the water column and atmosphere, converting the methane into carbon dioxide ($CO_2$). This process depleted oceanic oxygen, caused widespread ocean acidification, and amplified global warming via the greenhouse effect.

*Hypothesis 2 (Terrestrial Carbon Combustion)*
A prolonged period of severe regional drought, combined with orbitally induced seasonal extreme temperatures, lowered water tables in high-latitude peatlands. This dried out massive reservoirs of terrestrial organic matter, including peat and shallow coal deposits. Extensive, deep-burning wildfires swept across these regions, combusting vast quantities of terrestrial organic carbon ($\delta^{13}\text{C} \approx -25\text{‰}$ to $-30\text{‰}$) directly into the atmosphere as $CO_2$ and carbon monoxide ($CO$). The combustion released soot and greenhouse gases, causing rapid atmospheric warming and subsequent ocean acidification as atmospheric $CO_2$ dissolved into the surface ocean.

*Hypothesis 3 (Thermogenic Methane Generation)*
The emplacement of the North Atlantic Igneous Province (NAIP) involved large-scale intrusions of basaltic magma (sills) into organic-rich sedimentary basins, particularly Cretaceous shales. The extreme heat of the magma thermally cracked the sedimentary organic matter, generating vast quantities of thermogenic methane gas ($\delta^{13}\text{C} \approx -35\text{‰}$ to $-45\text{‰}$) and $CO_2$. These gases migrated upward through hydrothermal vent complexes, venting directly into the atmosphere and deep ocean. This rapid, crustally driven release of light carbon acidified the oceans and drove global greenhouse warming.

Based on the hypotheses presented, match each scientific proposition on the left with the correct level of support on the right.

A scientific model of a wind turbine's power output $P$ is described by the equation $P = \frac{1}{2} \rho A v^3 \eta$, where $\rho$ is the air density, $A$ is the swept area of the rotor blades ($A = \pi r^2$, where $r$ is the blade length), $v$ is the wind velocity, and $\eta$ is the turbine efficiency. Match each modification to the turbine's operating conditions or physical dimensions (on the left) with its corresponding mathematical effect on the power output $P$ (on the right), assuming all other variables remain constant.

### Passage

Researcher 1
The primary cause of the population decline of a certain frog species (*Rana temporaria*) in a woodland pond is the increasing acidity of the pond water, caused by acid rain. As the pH of the pond decreases below $6.0$, the hatching success of frog eggs drops significantly. Additionally, increased acidity dissolves protective mucosal coatings on the eggs, making them highly susceptible to lethal fungal infections. The introduction of predatory fish to the pond has no significant impact, because these fish prefer to feed on insects rather than frog tadpoles.

Researcher 2
The primary cause of the population decline is the introduction of a non-native predatory fish species to the pond. These fish feed heavily on both the frog eggs and tadpoles, preventing them from reaching adulthood. While a low pond pH (below $6.0$) does stress the frogs, it is not the main driver of the decline, as adult frogs can tolerate a wide pH range. However, low pH levels do dissolve the protective mucosal coating of the eggs, which exposes them to fungal infections. Therefore, both acidity and predation contribute to egg mortality, but predatory fish are the primary reason the population is collapsing.

### Question
Based on the viewpoints of Researcher 1 and Researcher 2, match each statement about the frog population decline to the researcher(s) who would support that statement.

Instruments on Mars orbiters and rovers have detected trace amounts of atmospheric methane ($CH_4$) that exhibit seasonal fluctuations, peaking during the late summer. Three scientists propose different models to explain the source and behavior of this methane.

Scientist 1 (Biogenic Model)
Martian methane is produced by subsurface methanogenic archaea (microbes). These microbes inhabit deep hydrothermal aquifers where liquid water is stable. The archaea combine hydrogen ($H_2$) and carbon dioxide ($CO_2$) from Martian rocks and fluid reservoirs to produce $CH_4$ and water as metabolic byproducts. Because microbial metabolic rates are temperature-dependent, methane production increases during the warmer summer months, leading to the observed seasonal fluctuations in atmospheric methane levels.

Scientist 2 (Geochemical Model)
Martian methane is generated through serpentinization, an abiotic (non-biological) reaction that occurs when subsurface olivine-rich rocks react with liquid water in the presence of dissolved carbon dioxide ($CO_2$). This reaction releases $CH_4$ gas, which is initially trapped in subsurface ice lattices (clathrates). During the Martian summer, warmer surface temperatures cause thermal expansion and micro-fracturing in the overlying permafrost, allowing the trapped geologic methane to escape into the atmosphere and producing the seasonal cycle.

Scientist 3 (Exogenous Model)
Martian methane is produced on the planet's surface via the ultraviolet (UV) photolysis of organic matter. Martian dust contains organic carbon compounds delivered by carbonaceous chondrite meteorites and micrometeorites that continuously bombard the planet. When exposed to solar UV radiation, these surface organic compounds degrade, releasing $CH_4$. The seasonal variation is driven directly by changes in solar UV flux, which peaks during the Martian summer due to the tilt of the planet's rotational axis. Liquid water is not involved in this surface reaction.

Based on the models provided, match each scientific claim on the left with the correct consensus status among the three scientists on the right.

Three models are proposed to explain the formation of hematite ($\text{Fe}_2\text{O}_3$) spherules, commonly called "blueberries," discovered in the Meridiani Planum region of Mars.

*Model 1*
Spherules formed in situ within porous basaltic volcanic rock. Upwelling volcanic fluids heated to temperatures between $150^\circ\text{C}$ and $250^\circ\text{C}$ circulated through underground aquifers. These fluids, neutral in pH and rich in dissolved iron, encountered sudden pressure drops, causing hematite to precipitate symmetrically in all directions within spherical pore spaces (vesicles). Because the vesicles were free of mineral grains, the resulting spherules consist of pure, crystalline hematite with no internal sedimentary inclusions.

*Model 2*
Spherules formed as chemical concretions in a shallow, highly acidic ($pH < 3.0$), hypersaline surface lake. Liquid water containing dissolved $\text{Fe}^{3+}$ ions seeped downward through porous quartz sandstone. The acidic water reacted with localized, alkaline carbonate minerals within the sandstone, raising the pH and causing hematite to precipitate outward from nucleation centers. Consequently, these spherules grew around and enveloped surrounding quartz sand grains, resulting in a concentric internal structure containing micro-grains of quartz.

*Model 3*
Spherules are impact spherules created during a hypervelocity meteorite impact on the Martian surface. The impact vaporized iron-rich basaltic target rocks and the iron-nickel meteorite itself, ejecting a plume of vapor and molten droplets into the upper atmosphere. As the droplets fell back toward the surface, they cooled and solidified into spherical shapes. The spherules accumulated as a distinct, widespread air-fall layer on top of preexisting rock units, rather than growing within them.

Match each description of a spherule's formation mechanism or physical constraint to the specific model that proposes it.

### Passage
An agricultural biologist investigated the physiological stress responses of the green alga *Chlorella vulgaris* exposed to common components of agricultural runoff. The study focused on four environmental variables: nitrate ($NO_3^-$) enrichment, phosphate ($PO_4^{3-}$) enrichment, atrazine (a widely used herbicide) exposure, and elevated temperature.

The biologist set up 5 culture flasks with identical initial densities of *C. vulgaris*. Each flask was subjected to a specific combination of nutrient concentrations, atrazine concentration, and temperature for 7 days. The experimental conditions for each flask are detailed in Table 1.

To evaluate the specific, independent contribution of each variable or combination of variables to algal stress, the biologist must compare the growth rates of algae in the experimental flasks against their appropriate control groups or baseline conditions.

### Matching Task
Match each of the following experimental objectives with the specific Flask that serves as its primary control group or baseline condition.

A research team investigated the photoelectrochemical (PEC) water-splitting efficiency of a bismuth vanadate ($BiVO_4$) photoanode. The experimental apparatus consisted of a three-electrode PEC cell connected to a potentiostat. The working electrode (photoanode) was illuminated by a simulated solar light source equipped with an Air Mass (AM) 1.5G filter and a water-filled optical filter. The electrochemical cell contained a $0.5\text{ M } Na_2SO_4$ aqueous electrolyte. A platinum ($Pt$) wire counter electrode was used to complete the circuit, and a silver/silver chloride ($Ag/AgCl$) electrode served as the reference. The gaseous products evolved at the electrodes were swept by an inert carrier gas into a gas chromatograph for quantification.

Match each component of the experimental apparatus to its primary function in this experimental setup.

### Solar Coronal Heating

The temperature of the solar corona (the Sun's outer atmosphere) is millions of kelvins ($\text{K}$), which is significantly hotter than the photosphere (the solar surface), which is only about $5,800\text{ K}$. Three hypotheses are proposed to explain how energy is transported from the photosphere and dissipated in the corona.

Wave Heating Hypothesis
Coronal heating is caused by magnetohydrodynamic (MHD) waves, specifically Alfvén waves. Convective motions of plasma in the photosphere continuously perturb magnetic field lines. This perturbation generates Alfvén waves that propagate upward along the magnetic field lines into the corona. The magnetic field acts as a waveguide, transporting this wave energy. Once in the corona, these waves undergo reflection and dissipation due to the low density of the coronal plasma, transferring their energy to the corona as thermal energy.

Nanoflare Hypothesis
Coronal heating is caused by magnetic reconnection. The convective motions of plasma in the photosphere twist and braid coronal magnetic field lines. This slowly stores magnetic energy in the coronal magnetic field. When the magnetic stress reaches a threshold, the magnetic field lines abruptly reconnect, releasing this stored magnetic energy in millions of localized, miniature explosions called "nanoflares." These nanoflares convert magnetic energy directly into thermal energy, heating the coronal plasma.

Turbulent Dissipation Hypothesis
Convective motions of plasma in the photosphere launch low-frequency magnetic waves. As these waves travel along the magnetic field lines into the corona, they interact with waves reflected from the boundaries of the corona. This interaction generates magnetohydrodynamic (MHD) turbulence. The turbulence cascades the energy to progressively smaller spatial scales. At very small scales, kinetic effects dissipate the turbulent energy, heating the corona.

Based on the three hypotheses, match each scientific statement about coronal heating to the specific category of agreement or uniqueness that describes it.

The Late Devonian mass extinction (approximately 372 million years ago) is characterized by a major loss of marine biodiversity and elevated concentrations of mercury ($Hg$) in sedimentary layers globally. Three hypotheses discuss the triggers and mechanisms of this extinction event.

Hypothesis 1
The extinction was triggered by the eruption of the Viluy Large Igneous Province (LIP). Massive volcanic eruptions released large volumes of carbon dioxide ($CO_2$) and gaseous $Hg$ into the atmosphere. The greenhouse effect from $CO_2$ caused rapid global warming and ocean stratification, leading to widespread marine anoxia (lack of oxygen). Meanwhile, atmospheric deposition of $Hg$ created global spikes in sedimentary mercury, poisoning marine ecosystems.

Hypothesis 2
The extinction was caused by a major asteroid impact. The impact vaporized target rocks, ejecting dust and sulfur compounds into the stratosphere, which blocked sunlight and caused a severe "impact winter" (global cooling). Acid rain from sulfur aerosols accelerated continental weathering, washing deep-seated terrestrial $Hg$ deposits into the oceans. This resulted in elevated sedimentary $Hg$ deposition and poisoned shallow marine habitats.

Hypothesis 3
The extinction was driven by sea-level fluctuations that forced deep, oxygen-depleted, and toxic hydrogen sulfide-rich ($H_2S$) waters onto shallow continental shelves. This toxic upwelling directly suffocated marine life. The high affinity of mercury for organic matter and sulfides caused $Hg$ already present in the ocean to bind rapidly to organic-rich sediments on the shelves, creating an apparent sediment $Hg$ anomaly without requiring any global atmospheric source of mercury.

Match each scientific statement with the combination of viewpoints that supports it.

Two students discuss the factors that influence the rate of carbon dioxide ($CO_2$) production during yeast fermentation.

Student 1
The fermentation rate depends solely on the type of sugar (glucose versus lactose) metabolized by the yeast. Yeast will ferment glucose much faster than lactose. The temperature of the yeast's environment has no effect on the rate of fermentation.

Student 2
The fermentation rate depends solely on the temperature of the yeast's environment. Higher temperatures increase yeast metabolic activity, leading to a higher fermentation rate. The specific type of sugar provided to the yeast does not affect the rate.

Match each hypothesis or claim on the left with the corresponding experimental outcome on the right that would directly disprove (invalidate) that claim.