GED Science Quiz: Analyze Scientific Data

What this quiz covers

This quiz focuses on Analyze Scientific Data, giving you a quick way to practice the rules, question types, and explanations that matter most for GED Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

1. Copper and aluminum are better conductors of heat than glass and wood. (correct answer)
2. Wood and glass are unable to transfer any heat from one end to the other.
3. All materials transfer heat at the exact same rate if they have the same dimensions.
4. Metals like copper and aluminum are better insulators of heat than non-metals.

Explanation: This question tests your understanding of heat conduction, which is how thermal energy moves through materials. When you see experiments comparing how quickly heat travels through different substances, focus on the concept of thermal conductivity. The experiment shows a clear pattern: copper heated up fastest, then aluminum, while glass and wood heated up very slowly. This directly demonstrates that copper and aluminum conduct heat much more effectively than glass and wood. Materials that allow heat to flow quickly are called good conductors, while those that resist heat flow are called insulators. Answer A correctly identifies this relationship. Looking at the wrong answers: Answer B is too extreme - while glass and wood are poor conductors, they do transfer some heat, just very slowly. The experiment shows their temperatures did increase, proving heat transfer occurred. Answer C contradicts the experimental results entirely, since the data clearly shows different materials transfer heat at very different rates despite having identical dimensions. Answer D contains a fundamental misconception - it confuses conductors with insulators. Metals like copper and aluminum are excellent conductors (not insulators), which is exactly why they heated up quickly. For GED Science questions about heat transfer, remember that metals are typically good conductors while non-metals (like wood, glass, plastic) are usually good insulators. This pattern appears frequently on the exam, so when you see experimental data showing different heating rates, immediately think about which materials would make better conductors versus insulators.

Question 2

1. Dinosaurs, amphibians, and trilobites all lived at the same time in different environments.
2. Amphibians in this area evolved directly from the local trilobite population.
3. Dinosaurs were the first form of life to exist in this particular location.
4. The environment of this location changed over time from a marine to a terrestrial one. (correct answer)

Explanation: When you encounter questions about rock layers and fossils, you're dealing with two fundamental geological principles: superposition (older layers are below younger ones in undisturbed rock) and using fossils to interpret ancient environments. Looking at this sequence from bottom to top, you can read it like a timeline. The lowest layer contains marine fossils (trilobites), indicating this area was once underwater. The middle layer has ferns and amphibians, suggesting a swampy, transitional environment between water and land. The top layer contains dinosaurs, which lived in terrestrial environments. This progression shows the environment changed from marine to terrestrial over geological time, making D correct. Choice A is wrong because the principle of superposition tells us these organisms lived at different times, not simultaneously in different environments. The layers represent different time periods, not different locations. Choice B incorrectly suggests direct evolution from trilobites to amphibians. While evolution did occur, you cannot conclude that local amphibians evolved directly from local trilobites just because their fossils appear in successive layers. Evolution is more complex than simple linear progression at one location. Choice C completely misinterprets superposition. Since dinosaur fossils are in the upper (youngest) layer, dinosaurs were actually among the last organisms to live here, not the first. Remember: Rock layers are like pages in Earth's history book. Always read from bottom (oldest) to top (youngest) to understand how environments and life changed through time.

Question 3

1. Photosynthesis can only occur if there is a bright light source very close to the plant.
2. The rate of photosynthesis in this plant decreases as light intensity decreases. (correct answer)
3. The amount of water in the test tube is the limiting factor for photosynthesis.
4. Oxygen is not a necessary product of the photosynthetic process in aquatic plants.

Explanation: This experiment tests your understanding of how environmental factors affect the rate of photosynthesis. When you see questions about controlled experiments measuring biological processes, focus on what variable was changed and how the measured outcome responded. The scientist changed one variable—light intensity (moving the light closer or farther away)—and measured oxygen bubble production as an indicator of photosynthesis rate. With bright, close light, the plant produced 30 bubbles per minute. When light intensity decreased (light moved farther away), bubble production dropped to 12 bubbles per minute. This shows a clear relationship: as light intensity decreases, the rate of photosynthesis decreases, making choice B correct. Choice A is wrong because photosynthesis still occurred when the light was farther away—just at a slower rate (12 bubbles vs. 30). The plant doesn't need extremely bright light to photosynthesize at all. Choice C incorrectly identifies water as the limiting factor, but the experiment kept water constant and only changed light intensity. Choice D contradicts basic photosynthesis knowledge and the experimental evidence—oxygen bubbles were clearly produced, proving oxygen is a product of photosynthesis in aquatic plants. For GED science questions involving controlled experiments, always identify what variable was manipulated and trace how it affected the measured outcome. Don't get distracted by absolute statements (like "only" or "never") in answer choices—biological processes rarely work in such extremes. Focus on relationships and trends in the data.

Question 4

1. Both tablets were effective at reducing bacteria, but Tablet A was more effective than Tablet B. (correct answer)
2. Tablet B is completely ineffective and should not be used for water purification.
3. Only Tablet A is capable of making contaminated water entirely safe to drink.
4. Adding both tablets together would result in eliminating 100% of the bacteria.

Explanation: When you encounter scientific data comparison questions, focus on what the numbers actually tell you versus what might seem intuitive or absolute. Looking at this water purification study, you need to compare the effectiveness percentages: Tablet A eliminated 99.5% of bacteria while Tablet B eliminated 92.0%. Both percentages are significantly high, indicating both tablets successfully reduce bacterial contamination. However, 99.5% is clearly greater than 92.0%, making Tablet A more effective. Answer A correctly captures both key findings: both tablets work well at reducing bacteria, but Tablet A performs better. This reflects what the data actually shows. Answer B is wrong because 92.0% elimination is quite effective—removing over 9 out of every 10 bacteria is far from "completely ineffective." Answer C makes an unsupported leap about safety. While Tablet A is highly effective at 99.5%, this doesn't mean the water is "entirely safe"—that would require 100% elimination plus consideration of other contaminants not tested. Answer D commits a mathematical error by assuming you can simply add percentages. Even if both tablets worked on different bacteria (which isn't stated), 99.5% + 92.0% doesn't equal 100% elimination. Study tip: On GED science questions involving data comparison, stick to what the numbers directly show you. Avoid extreme conclusions like "completely ineffective" or "entirely safe" unless the data explicitly supports them. Also, remember that percentages don't add together in the way whole numbers do.

Question 5

1. The moths are active at night because they are unable to see during the day.
2. This species of moth is completely safe from all predators during the nighttime.
3. The birds would be more successful if they learned to hunt for moths at night.
4. The moths' nocturnal behavior is likely an adaptation to avoid daytime predators. (correct answer)

Explanation: This question tests your understanding of evolutionary adaptations and how organisms respond to environmental pressures, particularly predation. When you see behavioral patterns that seem to correlate with predator activity, think about how natural selection shapes survival strategies. The key insight here is recognizing the relationship between the moths' behavior and their predators' activity patterns. The moths are active at night when their bird predators are inactive, and they rest during the day when the birds are hunting. This temporal separation isn't coincidental—it's likely an evolved adaptation that increases the moths' survival chances by reducing encounters with predators. Answer D correctly identifies this as an adaptive behavior. Natural selection would favor moths that avoid active predation periods, making nocturnal behavior an advantageous trait that gets passed on to offspring. Answer A incorrectly assumes the moths can't see during the day. Many moths actually have functional vision in daylight, so this explanation oversimplifies the behavior. Answer B makes an absolute claim that's unsupported—just because their main predators (birds) aren't active at night doesn't mean the moths face no nighttime threats from other predators like bats or spiders. Answer C shifts focus to what would make the birds more successful, but this doesn't address what we can conclude from the observed moth behavior. For GED science questions about animal behavior, always look for connections between an organism's actions and its environment, especially predator-prey relationships. Behaviors that seem to minimize risk or maximize survival are usually adaptations shaped by natural selection.

Question 6

1. Diet has no impact on bone density for individuals over the age of 50.
2. No one who exercises will ever experience a bone fracture.
3. A sedentary lifestyle is the single cause of all bone density loss in adults.
4. Weight-bearing exercise appears to be associated with maintaining higher bone density. (correct answer)

Explanation: When analyzing research studies, you need to distinguish between what the data actually shows versus broader claims that go beyond the evidence. This question tests your ability to identify conclusions that are directly supported by the study's findings. The study compared two specific groups: people who did weight-bearing exercise versus those with sedentary lifestyles. The results showed that the exercise group had higher bone density and fewer fractures. This creates a clear association between weight-bearing exercise and better bone health outcomes. Answer D correctly captures this relationship by stating that weight-bearing exercise "appears to be associated with" higher bone density. The word "appears" acknowledges that this is observational data, and "associated with" indicates correlation without claiming absolute causation. Answer A is wrong because the study didn't examine diet at all - you can't conclude anything about factors that weren't tested. Answer B makes an absolute claim ("no one who exercises will ever") that goes far beyond what the data shows. Even if the exercise group had fewer fractures, this doesn't mean zero fractures occurred. Answer C claims sedentary lifestyle is the "single cause of all bone density loss," which is an extreme overstatement. The study only compared two groups and doesn't account for other factors like genetics, medical conditions, or age-related changes. On GED Science questions about research studies, watch for answer choices that make absolute statements or draw conclusions about factors not tested in the study. The correct answer will typically match the scope and limitations of the actual research findings.

Question 7

1. The new plastic is completely resistant to all forms of environmental damage.
2. All types of plastic will become brittle after 500 hours of UV light exposure.
3. The plastic will become stronger if it is kept in the dark for more than 500 hours.
4. Exposure to intense UV light causes the degradation of this new plastic. (correct answer)

Explanation: When you encounter experiments testing materials under different conditions, focus on what the data actually shows versus what it doesn't prove. This question tests your ability to draw valid conclusions from controlled experimental results. The experiment clearly demonstrates that UV exposure caused significant changes to the plastic—it became brittle and lost 40% of its tensile strength, while the control samples (kept in darkness) remained unchanged. This direct comparison between experimental and control groups shows a clear cause-and-effect relationship between UV exposure and plastic degradation, making D correct. Let's examine why the other options are flawed: A is wrong because the plastic clearly wasn't resistant to UV damage—it degraded significantly. This option makes an overly broad claim that contradicts the experimental evidence. B incorrectly generalizes the results beyond what was tested. The experiment only tested one specific type of plastic, so you cannot conclude that all plastics would react the same way. C misinterprets the control group results. The control samples showed "no change," meaning they maintained their original properties—this doesn't mean they became stronger. Watch for this common pattern on science questions: experiments provide evidence for specific conclusions, but wrong answers often make claims that are too broad, too narrow, or completely unsupported by the data. Always ask yourself: "What does this experiment actually prove?" and avoid answers that go beyond what the evidence shows.

Question 8

1. The egg is less dense than Solution A but more dense than Solution B.
2. The egg's mass increased when it was placed in Solution B.
3. Adding more sugar to water increases the water's density. (correct answer)
4. Eggs will always sink in any sugar solution regardless of concentration.

Explanation: When you encounter questions about objects floating or sinking, you're dealing with density and buoyancy. The key principle is that an object will float if it's less dense than the liquid it's in, and sink if it's more dense. In this experiment, the egg sinks in Solution A (10g sugar in 100mL water) but floats in Solution B (20g sugar in 100mL water). Since the same egg behaves differently in these two solutions, the solutions themselves must have different densities. The egg must be denser than Solution A but less dense than Solution B. This tells us that Solution B has a higher density than Solution A. The only difference between the solutions is that Solution B contains more dissolved sugar. Therefore, adding more sugar to water increases the water's density, making answer C correct. Let's examine why the other answers are wrong: Answer A reverses the density relationships—if the egg were less dense than Solution A, it would float in that solution too. Answer B suggests the egg's mass changed, but mass is an intrinsic property that doesn't change when you move an object between solutions. Answer D contradicts the experimental evidence, since the egg clearly floats in the more concentrated sugar solution. Remember: When analyzing buoyancy problems on the GED, focus on density differences between the object and the liquid. The denser liquid can support less dense objects, while less dense liquids cannot support denser objects.

Question 9

1. The netting used on Plot 3 released chemicals that harmed the strawberry plants.
2. Strawberries can only grow if they are pollinated by bees and no other insects.
3. Bee pollination appears to be important for strawberry yield and quality. (correct answer)
4. Natural pollination is just as effective as introducing beehives for strawberry crops.

Explanation: This question tests your ability to analyze experimental data and draw logical conclusions from scientific evidence. When you encounter controlled experiments like this, focus on what the data actually shows rather than making assumptions beyond the evidence. The experiment clearly demonstrates that bee pollination significantly improves strawberry production. Plot 2, with added beehives, produced the largest and most numerous strawberries. Plot 1, relying on natural pollination, had moderate results. Plot 3, where insects were excluded, produced few small, misshapen strawberries. This pattern directly supports conclusion C - bee pollination appears important for strawberry yield and quality. Let's examine why the other options are incorrect. Option A assumes the netting released harmful chemicals, but there's no evidence for this chemical explanation - the poor results in Plot 3 are better explained by the lack of pollination. Option B claims strawberries can only be pollinated by bees, but Plot 1 shows that natural pollination (which includes other insects) still produced moderate yields. Option D contradicts the experimental results entirely - Plot 2 with beehives clearly outperformed Plot 1 with natural pollination. When analyzing scientific experiments on the GED, stick to what the data actually shows. Avoid explanations that introduce factors not mentioned in the experiment (like chemicals from netting) or that contradict the observed results. Look for the conclusion that best matches the experimental evidence without overstating or understating the findings.

Question 10

1. Corn plants cannot grow at all in soil with a pH of 5.0.
2. The only factor affecting corn yield is the pH level of the soil.
3. Adding lime to any field will always result in a greater yield of corn.
4. The increased corn yield was likely related to the adjustment of the soil's pH. (correct answer)

Explanation: When you encounter questions about scientific conclusions and data interpretation, focus on what the evidence actually supports versus what it doesn't prove. The farmer's data shows a clear pattern: fields with pH 6.0-6.5 had better yields than the field with pH 5.0. After adding lime raised that field's pH to 6.2, its yield increased significantly. This evidence strongly suggests that pH adjustment was responsible for the improved yield, making D the most reasonable conclusion. Let's examine why the other options overreach beyond what the data supports: A claims corn cannot grow at all in pH 5.0 soil, but the passage states the field did produce corn—just fewer bushels per acre. The corn grew, just poorly. B states pH is the only factor affecting yield. This is too absolute. While pH was clearly important here, many factors influence crop yields (nutrients, water, pests, weather). The farmer only tested one variable. C suggests lime always increases corn yield. This overgeneralizes from one successful case. If a field already had optimal pH, adding more lime might actually harm yields. Notice how D uses careful language—"likely related to" rather than claiming definitive causation. Good scientific conclusions match the strength of the evidence. GED Strategy: Watch for answer choices that use absolute words like "only," "always," "never," or "cannot." These are often incorrect because they make claims stronger than what limited data can support. Scientific conclusions should be appropriately cautious.

Question 11

1. Ground swelling and changes in gas composition may be precursor signals to an eruption. (correct answer)
2. All volcanic eruptions are preceded by the exact same amount of ground swelling.
3. The eruption was caused by an earthquake that occurred deep beneath the volcano.
4. Sulfur dioxide is the only gas that is ever released by an active volcano.

Explanation: When you encounter questions about volcanic activity and scientific observations, focus on distinguishing between what the data directly supports versus unsupported generalizations or assumptions. The scientists observed two specific changes before the eruption: ground swelling and increased sulfur dioxide emissions. These are factual observations that occurred in sequence with the eruption. Answer A correctly identifies these as potential precursor signals - observable changes that may indicate an upcoming eruption. This is a reasonable scientific conclusion because it's based directly on the documented pattern. Answer B makes an overgeneralization by claiming "all volcanic eruptions" follow the exact same pattern with identical amounts of ground swelling. Scientific observations from one volcano cannot support such a broad claim about all volcanoes everywhere. Answer C introduces information not provided in the passage. While earthquakes can be associated with volcanic activity, the passage mentions no earthquake data. This choice asks you to assume causation without evidence. Answer D contains an absolute statement that's easily disproven. Volcanoes emit many different gases including water vapor, carbon dioxide, and hydrogen sulfide - not just sulfur dioxide. For GED Science questions involving scientific observations, remember to stick closely to what the data actually shows. Correct answers typically reflect reasonable conclusions drawn directly from the evidence presented, while wrong answers often contain unsupported generalizations (like "all" or "only"), introduce outside information, or make claims beyond what the data can support.

Question 12

1. All plants require fertilizer to grow to a height of at least 75 cm.
2. The fertilizer used in the experiment improved the growth of the tomato plants studied. (correct answer)
3. Plants in Group B were unhealthy because they did not receive any fertilizer.
4. Fertilizer is the only factor that influences the final height of a tomato plant.

Explanation: When analyzing scientific experiments, you need to focus on what the data actually shows versus what it might suggest about broader principles. The key is distinguishing between valid conclusions supported by the evidence and overgeneralized claims. The experiment provides clear evidence that the fertilized plants (Group A) grew taller on average (75 cm) than the unfertilized plants (Group B) (50 cm), with all other variables controlled. This directly supports answer B – the fertilizer improved growth in these specific tomato plants under these conditions. Answer A is wrong because the experiment doesn't test whether fertilizer is required for all plants to reach 75 cm. The unfertilized plants still grew to 50 cm, showing growth is possible without fertilizer, and we can't generalize to all plant species. Answer C incorrectly assumes the Group B plants were unhealthy. Growing to 50 cm demonstrates the plants were alive and functioning – they simply grew less than the fertilized group. "Unhealthy" implies disease or dysfunction, which isn't supported by the height data. Answer D commits a classic scientific error by claiming fertilizer is the "only" factor affecting plant height. The experiment only tested one variable (fertilizer) while controlling others. Many factors influence plant growth – genetics, soil pH, temperature, etc. – that weren't examined here. Remember: Strong scientific conclusions match the scope of the data collected. Avoid answers that use absolute terms like "all," "only," or "never" unless the experiment specifically tested those broad claims.

Question 13

1. The increase in global temperature is the sole cause of the increase in atmospheric CO2.
2. Volcanic eruptions are the primary factor responsible for the observed changes in CO2.
3. Atmospheric CO2 levels and global temperatures will continue to rise at the same rate forever.
4. There is a positive correlation between atmospheric CO2 concentration and average global temperature. (correct answer)

Explanation: When you encounter data showing two variables changing together over time, you need to distinguish between correlation and causation. This question tests your ability to draw appropriate conclusions from observational data. The passage describes a clear pattern: as atmospheric CO2 concentrations increased from 1960 to 2020, global temperatures also increased, and years with higher CO2 consistently matched years with higher temperatures. This describes a positive correlation—when one variable increases, the other tends to increase as well. Answer D correctly identifies this relationship as a positive correlation, which is exactly what the data supports. The evidence shows the two variables moving together in the same direction consistently over 60 years. Answer A reverses the suspected cause-and-effect relationship and uses absolute language ("sole cause") that goes far beyond what correlation data can prove. Correlation never proves causation, regardless of direction. Answer B introduces volcanic eruptions, which aren't mentioned anywhere in the passage. This is a classic distractor that brings in outside knowledge about CO2 sources that isn't supported by the given data. Answer C makes predictions about future trends ("will continue...forever") and assumes the rate of change will remain constant. The data only covers past observations and cannot support claims about future patterns or rates. Remember: when analyzing scientific data, stick to what the evidence actually shows. Correlation questions often include tempting answers that claim causation or make predictions beyond the data's scope. Focus on describing the relationship you can observe, not explaining why it exists.

Question 14

1. The only factor that determines a person's lifespan is their smoking habit.
2. Every person who smokes more than 20 cigarettes per day will die at age 65.
3. Moderate smoking has no negative impact on an individual's lifespan.
4. Smoking cigarettes is associated with a decrease in average lifespan. (correct answer)

Explanation: When analyzing scientific data about correlations and causation, you need to carefully distinguish between what the data actually shows versus broader claims that go beyond the evidence. The study presents clear data showing a pattern: as smoking increases, average lifespan decreases (78 years for non-smokers, 71 for moderate smokers, 65 for heavy smokers). This demonstrates an association between smoking and reduced lifespan, making D the correct answer. The data consistently shows that higher smoking levels correlate with shorter average lifespans. Looking at why the other options fail: A claims smoking is the "only factor" determining lifespan, which is an extreme overstatement—many factors affect lifespan including genetics, diet, exercise, and medical care. B misinterprets what "average" means; saying every heavy smoker dies at 65 confuses an average with an absolute prediction. Some heavy smokers will live longer or shorter than 65 years. C contradicts the data directly—moderate smokers averaged 7 fewer years than non-smokers, clearly showing a negative impact. The key distinction here is between correlation (what this study shows) and causation (which would require controlled experiments). The study reveals an association but doesn't prove smoking directly causes shorter lifespans, though that's the most reasonable interpretation. GED Science tip: Watch for answer choices that use absolute language like "only," "every," or "always" when interpreting data—these are usually incorrect because scientific data typically shows trends and averages, not universal rules.

Question 15

1. Lettuce seeds require highly acidic conditions in order to germinate properly.
2. No seeds will germinate if the water's pH is lower than 3.
3. As the acidity of the water increases, the germination rate of lettuce seeds decreases. (correct answer)
4. The acidity of water has no significant effect on the germination of any plant seeds.

Explanation: When you encounter data analysis questions on the GED Science exam, focus on identifying patterns and relationships in the given data rather than making assumptions beyond what's directly shown. Looking at this germination study, you need to examine the relationship between pH levels and germination rates. The data shows a clear inverse relationship: as pH decreases (meaning acidity increases), germination rates consistently drop. At pH 7 (neutral), 95% of seeds germinated. At pH 5 (moderately acidic), only 60% germinated. At pH 3 (very acidic), just 10% germinated. This steady decline from 95% to 60% to 10% demonstrates that increasing acidity correlates with decreasing germination success, making answer C correct. Answer A contradicts the data entirely—the seeds performed best in neutral conditions, not highly acidic ones. Answer B makes an unsupported absolute claim; the study shows 10% of seeds did germinate at pH 3, and we have no data about pH levels below 3. Answer D ignores the dramatic differences in germination rates (95% vs. 10% is highly significant) and inappropriately generalizes from lettuce seeds to "any plant seeds." Remember that data analysis questions test your ability to identify trends and draw conclusions that stay within the bounds of what's actually measured. Avoid answers that make absolute statements ("no seeds will...") or overgeneralize beyond the study's scope. Focus on the specific relationship the data reveals.

Question 16

1. The climate in the northern forest is the primary factor controlling both populations.
2. Lynx populations are solely determined by the availability of snowshoe hares for food.
3. Snowshoe hare populations decline because of diseases spread by the increasing number of lynx.
4. The populations of snowshoe hares and lynx appear to be linked in a predator-prey relationship. (correct answer)

Explanation: When you encounter population data showing cyclical patterns between two species, you're likely looking at ecological relationships. The key is identifying what type of relationship the data supports. The observations show a clear pattern: high hare populations lead to increased lynx populations the following year, which then causes hare populations to decline sharply. This delayed response pattern is the classic signature of a predator-prey relationship. When prey (hares) are abundant, predators (lynx) have more food, survive better, and reproduce more successfully. The increased predator population then puts pressure on the prey population, causing it to crash. This creates the cyclical boom-and-bust pattern described. Choice D correctly identifies this predator-prey dynamic. The timing and sequence of population changes directly support this conclusion. Choice A incorrectly suggests climate as the primary factor. While climate affects populations, the data specifically shows one species' population changes following the other's, not both responding simultaneously to external conditions. Choice B is too extreme, claiming lynx populations are "solely" determined by hare availability. Real ecosystems are more complex, and the word "solely" makes this an overstatement not supported by the limited data. Choice C misinterprets the mechanism. There's no evidence of disease transmission - the population decline follows increased predation pressure, not illness spread by contact. Remember: On ecology questions, look for cause-and-effect relationships in the timing of population changes. Predator-prey cycles show this characteristic delayed response pattern where predator populations lag behind prey populations.

Question 17

1. Bacterium Y is a more dangerous pathogen to humans than Bacterium X.
2. The antibiotic is effective against Bacterium X but not against Bacterium Y. (correct answer)
3. All antibiotics will be ineffective against Bacterium Y due to its resistance.
4. The antibiotic will be effective against all types of bacteria except Bacterium Y.

Explanation: When you encounter questions about antibiotic effectiveness, focus on what the experimental data actually shows rather than making broad assumptions beyond the evidence. The experimental results are clear: the antibiotic reduced Bacterium X by 99.9% (highly effective) while Bacterium Y's population remained stable (no effect). This directly demonstrates that the antibiotic works against one bacterium but not the other, making B the correct answer. Let's examine why the other choices are flawed: A suggests that Bacterium Y is more dangerous to humans, but the passage provides no information about pathogenicity or human health effects—only about antibiotic response. You cannot determine how dangerous a bacterium is based solely on antibiotic resistance. C makes an overgeneralization by claiming ALL antibiotics will be ineffective against Bacterium Y. The experiment only tested one antibiotic. Different antibiotics work through different mechanisms, so resistance to one doesn't guarantee resistance to all others. D similarly overgeneralizes by claiming this antibiotic will work against ALL other bacteria except Bacterium Y. The experiment only tested two bacterial species, so you cannot make conclusions about the antibiotic's effectiveness against other untested bacteria. Study tip for GED Science: When analyzing experimental results, stick to what the data directly shows. Avoid answer choices that make sweeping generalizations beyond the scope of the experiment or introduce information not provided in the passage. Focus on the specific comparison being made.

Question 18

1. The different insect species appear to be adapted to different river habitats. (correct answer)
2. The insects in Section 2 are predators that have eaten all the insects from Section 1.
3. Water pollution has eliminated species A, B, and C from the fast-moving section of the river.
4. All rivers contain the exact same distribution of insect species from source to mouth.

Explanation: When you encounter ecology questions about species distribution, focus on the relationship between organisms and their environment. Different species have evolved specific adaptations that help them thrive in particular habitats. The data shows a clear pattern: species A, B, and C dominate the slow-moving, muddy section, while species X, Y, and Z dominate the fast-moving, rocky section. This distribution strongly suggests that each group has evolved traits suited to their respective environments. Species in fast-moving water likely have adaptations like strong gripping structures or streamlined bodies, while those in slow-moving water might be better at burrowing in mud or filtering food from sediment. This supports answer A - the different insect species appear to be adapted to different river habitats. Answer B incorrectly assumes predation is the primary factor, but predator-prey relationships wouldn't create such distinct, habitat-based distributions. Answer C jumps to pollution as an explanation without any evidence of contamination in the passage - the rocky, fast-moving section could simply be unsuitable habitat for species A, B, and C. Answer D contradicts the data entirely, as the study clearly shows different species distributions in different river sections. For GED science questions about ecosystems, remember that species distributions usually reflect habitat preferences and evolutionary adaptations. When you see organisms segregated by environment type (like water speed or substrate), think adaptation rather than assuming more complex explanations like pollution or predation without supporting evidence.

Question 19

1. Getting eight hours of sleep is associated with better memory consolidation. (correct answer)
2. Students in Group 2 did not try as hard to remember the vocabulary words.
3. Any amount of sleep deprivation will result in exactly a 30% drop in memory recall.
4. The only factor that ever affects a person's ability to remember is the amount of sleep.

Explanation: When you encounter scientific studies on the GED, focus on what the data actually shows versus what it might suggest about broader patterns. The key is distinguishing between what the evidence directly supports and what goes beyond the scope of the study. Looking at this sleep and memory study, Group 1 (with 8 hours of sleep) recalled 85% of words while Group 2 (no sleep) recalled only 55%. This data directly demonstrates an association between getting adequate sleep and better memory performance, making choice A correct. The results show that sleep appears to help with memory consolidation - the process by which memories become more stable and retrievable. Choice B assumes motivation differences between groups, but the study provides no evidence about student effort levels. You can't conclude this from memory performance alone. Choice C makes an overly specific claim about "exactly a 30% drop" and generalizes to "any amount of sleep deprivation," when the study only tested complete sleep deprivation versus 8 hours of sleep. Choice D uses absolute language ("only factor that ever affects") which is far too broad - the study only examined sleep's role, not all possible memory factors. Remember that scientific conclusions should match the scope and specificity of the evidence presented. Watch for answer choices that make claims about motivation, exact percentages, or absolute statements when the data doesn't support such specificity. Stick to what the numbers actually demonstrate rather than unsupported assumptions.

Question 20

1. The birds learned to eat other food sources after the hurricane in 2012.
2. Hurricanes are the only natural disaster that can affect this species of bird.
3. The bird population will inevitably grow to exceed 500 individuals in the near future.
4. The bird population on the island is dependent on the availability of fruit-bearing trees. (correct answer)

Explanation: When you encounter questions about population changes and environmental factors, look for clear cause-and-effect relationships in the data. The key is identifying which factor most directly correlates with the population changes observed. The data shows a clear pattern: when fruit-bearing trees were destroyed by the hurricane in 2012, the bird population dropped dramatically from 500 to 200 by 2013. As the trees recovered over time, the population rebounded to 450 by 2020. This direct correlation between tree availability and population size strongly indicates the birds depend on these trees for survival, making D the correct answer. Let's examine why the other options don't fit the evidence. Choice A suggests the birds adapted by eating other food sources, but this doesn't explain why the population still dropped so severely and only recovered as the trees returned. If they had successfully adapted to alternative foods, we'd expect a faster recovery independent of tree regrowth. Choice B makes an extreme claim about hurricanes being the "only" natural disaster affecting these birds, but the passage provides no information about other potential disasters. Choice C predicts future growth beyond 500 individuals, but the data doesn't support this conclusion—the population hasn't even fully recovered to pre-hurricane levels yet. For GED science questions involving population ecology, focus on identifying the most direct relationship between environmental changes and population responses. Avoid answers that make unsupported predictions about the future or overly broad generalizations not backed by the specific data provided.