GED Science Test practice questions
201 free questions with answers and explanations.
- 101.A space probe is designed to study the composition of a newly discovered planet. The planet is observed to be large, with a low density, and composed primarily of hydrogen and helium. It also has a strong magnetic field and a complex ring system. Based on these characteristics, how would this planet be classified?Earth and Space Science
- 102.A homeowner is considering installing solar panels. They live in a region that experiences significant seasonal variations in sunlight hours. Which of the following Earth movements is primarily responsible for these seasonal changes in the amount of solar energy received at different latitudes?Earth and Space Science
- 103.A geochemist is studying the impact of increased atmospheric carbon dioxide on marine ecosystems. They observe that as more CO2 dissolves into the ocean, the concentration of hydrogen ions (H+) in seawater increases. Which term best describes the resulting change in ocean chemistry?Earth and Space Science
- 104.A space probe detects an exoplanet orbiting its star within the 'habitable zone.' Which characteristic is primarily indicated by a planet being within its star's habitable zone?Earth and Space Science
- 105.A geneticist is studying a population of fruit flies. They observe that a certain gene has two alleles: one for red eyes (R) and one for white eyes (r). Red eyes are dominant to white eyes. If a heterozygous red-eyed male (Rr) is crossed with a white-eyed female (rr), what percentage of their offspring are expected to have white eyes?Life Science
- 106.A student is observing plant cells under a microscope. They notice a rigid outer layer that provides structural support and protection to the cell, located external to the plasma membrane. Which of the following organelles or structures is the student observing?Life Science
- 107.A client is experiencing symptoms of chronic fatigue, muscle weakness, and impaired bone health. Blood tests reveal low levels of a particular vitamin that is crucial for calcium absorption and bone mineralization. Which vitamin deficiency is most likely causing these symptoms?Life Science
- 108.A gardener notices that a specific type of plant consistently produces either red flowers or white flowers, but never pink flowers, even when crossing red and white parents. Which of the following inheritance patterns does this observation most accurately represent?Life Science
- 109.A patient experiences a sudden, severe allergic reaction after consuming a food item. Symptoms include widespread hives, swelling of the face and throat, difficulty breathing, and a rapid drop in blood pressure. Which type of immune response is most likely occurring?Life Science
- 110.A client is diagnosed with a severe vitamin D deficiency. Which of the following is an essential role of vitamin D in the human body?Life Science
- 111.A patient is undergoing treatment for a chronic autoimmune disease where their immune system mistakenly attacks healthy body tissues. A new class of medication aims to suppress specific immune cells that are overactive in this condition, thereby reducing inflammation and tissue damage. Which type of immune cell is most likely being targeted by this medication to modulate the autoimmune response?Life Science
- 112.A scientist is studying a population of rabbits in a grassland ecosystem. Over several generations, she observes that the average fur color of the rabbits shifts from predominantly light brown to a darker mottled brown. This change coincides with an increase in the population of predatory hawks in the area. Which of the following evolutionary mechanisms best explains this observed change in rabbit fur color?Life Science
- 113.A patient experiences a sudden, severe allergic reaction after being stung by a bee. Symptoms include widespread hives, swelling of the face and throat, difficulty breathing, and a rapid drop in blood pressure. Which type of immune response is this patient exhibiting?Life Science
- 114.A biologist is studying a population of deer in a newly introduced habitat. Over several generations, she observes that deer with longer legs are better able to outrun predators and access higher vegetation, leading to increased survival and reproduction rates for these individuals. This phenomenon is an example of:Life Science
- 115.A client is diagnosed with a severe deficiency in vitamin C. Which of the following symptoms would be most directly attributable to this deficiency?Life Science
- 116.An ecologist is studying the energy flow in a forest ecosystem. She measures the total biomass of producers (trees, plants) and primary consumers (herbivores like deer, rabbits). If the producers in this ecosystem have a biomass of 10,000 kg, what is the *approximate* maximum biomass that could be sustained at the primary consumer level, assuming a typical energy transfer efficiency?Life Science
- 117.A biologist is studying a newly discovered species of fish in a freshwater lake. They observe that the fish migrate to different parts of the lake depending on the season, seeking out areas with specific water temperatures for spawning and feeding. This behavior illustrates which of the following ecological concepts?Life Science
- 118.A medical researcher is developing a new drug that inhibits the reabsorption of water in the kidneys, leading to increased urine output. Which part of the nephron is the drug most likely targeting?Life Science
- 119.A group of scientists is studying a population of deer in a forest. They observe that over several generations, the average antler size of male deer has significantly decreased. Which of the following is the most likely explanation for this observation, assuming natural selection is at play?Life Science
- 120.A medical researcher is investigating a new drug designed to inhibit viral replication. This drug specifically targets an enzyme responsible for converting the viral RNA genome into DNA, which is then integrated into the host cell's genome. Which type of virus is this drug most likely designed to combat?Life Science
- 121.A patient is diagnosed with a bacterial infection. The doctor prescribes an antibiotic that targets the ribosomes of the bacteria. Which cellular process will this antibiotic directly inhibit?Life Science
- 122.A group of scientists is studying a remote island ecosystem. They observe that a new invasive plant species has rapidly spread, outcompeting native plants for resources like sunlight and nutrients. This has led to a decline in native herbivore populations and an overall decrease in the island's biodiversity. This scenario best illustrates which ecological concept?Life Science
- 123.A student is designing an experiment to investigate the effect of different light intensities on the rate of photosynthesis in a plant. Which of the following would be the most appropriate dependent variable to measure?Life Science
- 124.A patient is undergoing rehabilitation after a stroke. The physical therapist focuses on exercises to improve muscle coordination and balance. Which part of the brain is primarily responsible for these functions and would likely have been affected by the stroke?Life Science
- 125.A client is experiencing persistent fatigue, muscle weakness, and frequent cramps. A blood test reveals an imbalance in electrolytes, specifically low levels of sodium and potassium. Which organ system is primarily responsible for regulating the balance of these electrolytes in the body?Life Science
- 126.A person experiences a sudden drop in blood pressure, dizziness, and difficulty breathing after being stung by a bee. This severe allergic reaction is known as:Life Science
- 127.A public health official is investigating a sudden outbreak of a viral disease. Rapid diagnostic tests confirm the presence of viral RNA in infected individuals. The virus is known to integrate its genetic material into the host cell's DNA before replication. Which class of viruses is most likely responsible for this outbreak?Life Science
- 128.A public health official is investigating an outbreak of a respiratory illness. They discover that the pathogen responsible is a virus that primarily targets and destroys helper T cells (CD4+ T cells). What long-term impact would this have on the immune system of an infected individual?Life Science
- 129.A patient presents with symptoms including unexplained weight loss, chronic fatigue, and frequent opportunistic infections such as pneumonia and candidiasis. Blood tests reveal a significantly reduced CD4+ T cell count. Which of the following conditions is most likely indicated by these findings?Life Science
- 130.A biologist is studying a newly discovered species of deep-sea bacteria. Preliminary analysis shows that these bacteria thrive in environments completely lacking sunlight and oxygen, utilizing chemical compounds from hydrothermal vents as their sole energy source. This organism's primary mode of nutrition is best described as:Life Science
- 131.A patient is experiencing severe muscle cramps, weakness, and an irregular heartbeat. Blood tests reveal an imbalance in the concentration of certain ions crucial for nerve impulse transmission and muscle contraction. Which regulatory system is primarily responsible for maintaining the balance of these essential ions in the body?Life Science
- 132.A geneticist is studying a population of fruit flies. They observe that a certain gene has two alleles: one for red eyes (R) and one for white eyes (r). If a male fruit fly with red eyes (heterozygous Rr) is crossed with a female fruit fly with white eyes (rr), what percentage of their offspring are expected to have white eyes?Life Science
- 133.A public health official is investigating a sudden increase in cases of a waterborne illness in a community. Which of the following is the most effective initial step to prevent further spread?Life Science
- 134.A genetic counselor is explaining the inheritance pattern of a specific trait to a couple. The trait appears in every generation, affects males and females equally, and an affected parent always has at least one affected offspring. This pattern is characteristic of:Life Science
- 135.A marine biologist is studying a population of deep-sea hydrothermal vent organisms. These organisms form the base of the food web in this ecosystem, obtaining energy by oxidizing inorganic compounds such as hydrogen sulfide. What term best describes their mode of nutrition?Life Science
- 136.A scientist is studying a population of bacteria that has developed resistance to a common antibiotic. This resistance allows them to survive and reproduce more effectively in the presence of the antibiotic. Which of the following biological processes best explains the increase in the proportion of resistant bacteria over generations?Life Science
- 137.A patient presents with symptoms of extreme thirst, frequent urination, and unexplained weight loss. Blood tests reveal persistently high blood glucose levels. Which of the following hormones is most likely deficient or ineffective in this patient?Life Science
- 138.A scientist is studying a population of bacteria that has developed resistance to a common antibiotic. She observes that the resistant bacteria are able to break down the antibiotic compound, rendering it harmless. This adaptation allows the resistant bacteria to thrive while non-resistant bacteria are eliminated. This is an example of which of the following?Life Science
- 139.An ecologist is studying the energy flow in a forest ecosystem. She measures the total biomass at different trophic levels. If the primary producers (plants) have 10,000 kcal of energy, and assuming typical energy transfer efficiency, how much energy would typically be available to tertiary consumers?Life Science
- 140.A medical researcher is studying a rare genetic disorder. She discovers that individuals with the disorder have a mutation in a gene that codes for a protein involved in the regulation of cell division. This mutation causes cells to divide uncontrollably, forming abnormal masses of tissue. This scenario best describes the cellular basis of which disease?Life Science
- 141.A farmer notices that a particular variety of corn planted in a specific field consistently yields smaller cobs and fewer kernels compared to the same variety planted in other fields on his farm. Soil analysis reveals that the problem field has significantly lower levels of nitrogen. Which of the following biological processes is most directly impaired by this nitrogen deficiency, leading to reduced corn yield?Life Science
- 142.A farmer observes that one of his fields consistently yields crops with stunted growth and yellowing leaves, despite adequate watering and sunlight. A soil test reveals very low levels of phosphorus. Which of the following is the most likely reason for these symptoms?Life Science
- 143.A patient is experiencing severe muscle cramps, weakness, and an irregular heartbeat. Blood tests reveal an abnormally low level of potassium. Which organ system is primarily responsible for regulating the balance of electrolytes like potassium in the body?Life Science
- 144.A geneticist is studying a trait in fruit flies where red eyes (R) are dominant to white eyes (r). If a heterozygous red-eyed male (Rr) is crossed with a white-eyed female (rr), what percentage of their offspring are expected to have white eyes?Life Science
- 145.A medical student is studying the human nervous system. They learn that a specific neuron type is responsible for transmitting information from sensory receptors (like those in the skin or eyes) towards the central nervous system. Which term best describes this type of neuron?Life Science
- 146.A medical researcher is investigating a new drug designed to inhibit viral replication. The drug specifically targets the enzymes responsible for synthesizing viral DNA from an RNA template. This drug would be most effective against which type of virus?Life Science
- 147.A medical student is studying the human nervous system. They learn that a specific neuron transmits signals from sensory receptors in the skin to the central nervous system, where the information is processed. This type of neuron is best classified as a:Life Science
- 148.A farmer is concerned about the declining population of pollinator insects in his area, which is negatively impacting his crop yields. To promote biodiversity and support pollinators, he decides to plant a strip of native wildflowers around his fields. This action is an example of:Life Science
- 149.A marine biologist is studying a population of deep-sea hydrothermal vent organisms. These organisms live in complete darkness and rely on chemical energy from hydrogen sulfide to produce organic compounds. What term best describes their mode of nutrition?Life Science
- 150.A genetic counselor is explaining the inheritance pattern of a specific trait to a couple. She states that if a child inherits just one copy of the affected allele, they will express the trait, regardless of the other allele. This means that the trait appears in every generation and an affected individual has a 50% chance of passing it to each child. Which of the following inheritance patterns is being described?Life Science