GED Science Test practice questions
201 free questions with answers and explanations.
- 151.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 escape predators, while deer with shorter legs are better able to navigate dense undergrowth to find food. This leads to a population with both very long-legged and very short-legged deer, while deer with medium-length legs become less common. What type of natural selection is occurring in this population?Life Science
- 152.A marine biologist is studying a population of seals that exhibit varying fur thickness. Over several generations, she observes that seals with thicker fur are more likely to survive and reproduce in colder waters, while seals with thinner fur are more successful in warmer waters. This leads to two distinct groups of seals, each adapted to their respective environments. What type of natural selection is occurring in this population?Life Science
- 153.A public health official is concerned about the potential for a novel virus to spread rapidly through the population. The virus is known to have a short incubation period and high transmissibility. Which of the following strategies would be most effective in preventing an epidemic in the early stages?Life Science
- 154.A gardener observes that a particular type of plant consistently produces red flowers when self-pollinated, but when crossed with a different plant that produces white flowers, all offspring have pink flowers. This pattern of inheritance is best described as:Life Science
- 155.A biologist is studying a population of brightly colored frogs in a rainforest. She observes that these frogs have a potent toxin in their skin, which deters predators. This defense mechanism, combined with their vivid coloration, is an example of which evolutionary strategy?Life Science
- 156.A client is experiencing chronic stress due to work-related pressures. This prolonged stress is leading to elevated levels of cortisol, a hormone primarily released by which endocrine gland?Life Science
- 157.A plant biologist is studying a newly discovered species of carnivorous plant. She observes that these plants grow in nutrient-poor, boggy soils. To supplement their nutrient intake, particularly nitrogen, these plants capture and digest insects. This adaptation is primarily a response to a deficiency in which essential element in their environment?Life Science
- 158.Which component of the human blood is primarily responsible for transporting oxygen from the lungs to the body's tissues?Life Science
- 159.A farmer is cultivating a new variety of corn. He notices that when he exposes the plants to longer periods of darkness, they tend to flower earlier. This observation suggests that the flowering of this corn variety is regulated by:Life Science
- 160.A patient presents with symptoms of extreme thirst, frequent urination, and unexplained weight loss. Blood tests reveal persistently high blood glucose levels. These symptoms are most indicative of a malfunction in which of the following organs?Life Science
- 161.A geneticist is studying a population of pea plants. She performs a monohybrid cross between two heterozygous tall plants (Tt x Tt), where tall (T) is dominant to short (t). What is the expected phenotypic ratio of tall to short offspring?Life Science
- 162.A patient arrives at the emergency room with a high fever, severe headache, and a stiff neck. A lumbar puncture is performed, and the cerebrospinal fluid (CSF) analysis reveals a high white blood cell count, low glucose, and elevated protein levels. Which of the following conditions is most likely indicated by these findings?Life Science
- 163.A client is experiencing symptoms of chronic fatigue, muscle weakness, and impaired bone healing. A blood test reveals low levels of a specific vitamin. The physician recommends dietary changes and supplements to increase the intake of this vitamin, which is crucial for calcium absorption and bone mineralization. Which vitamin is being described?Life Science
- 164.A patient is diagnosed with a severe deficiency of intrinsic factor. Which of the following is the most likely consequence of this deficiency?Life Science
- 165.A patient is undergoing treatment for a chronic autoimmune disease where their immune system mistakenly attacks healthy tissues. The physician prescribes a medication that specifically targets and suppresses the activity of T-lymphocytes. What is the most likely intended effect of this medication?Life Science
- 166.A scientist is studying a newly discovered single-celled organism. Microscopic examination reveals that the organism lacks a membrane-bound nucleus and other membrane-bound organelles. Its genetic material is located in a nucleoid region. Based on these characteristics, how would this organism be classified?Life Science
- 167.A medical student is learning about the human immune system. They are taught that a specific type of white blood cell is primarily responsible for producing antibodies to fight off infections. Which of the following cells fits this description?Life Science
- 168.A marine biologist is studying a population of sea turtles that primarily feed on jellyfish. Over the last decade, there has been a significant decline in the jellyfish population due to ocean acidification impacting their reproductive cycle. What is the most likely long-term consequence for the sea turtle population?Life Science
- 169.A medical researcher is studying a group of individuals who have a genetic predisposition to a certain autoimmune disease. The disease is characterized by the immune system mistakenly attacking healthy cells and tissues in the body. Which of the following components of the immune system is primarily responsible for differentiating between 'self' (healthy body cells) and 'non-self' (pathogens or abnormal cells) to prevent such autoimmune responses?Life Science
- 170.A genetic counselor is explaining the inheritance pattern of a rare genetic disorder to a couple. The disorder appears in every generation, affects both males and females equally, and an affected parent has a 50% chance of passing the disorder to each child. What type of inheritance pattern is being described?Life Science
- 171.A public health official is investigating a sudden increase in cases of a mosquito-borne illness in a rural area. The official recommends a multi-pronged approach to control the spread. Which of the following strategies would be the LEAST effective in preventing the transmission of this disease?Life Science
- 172.A group of scientists is studying a population of Galapagos finches. They observe that during a prolonged drought, finches with larger, stronger beaks are better able to crack open the tough seeds that are still available, while finches with smaller beaks struggle to find food. Over several generations, the average beak size in the population increases. This is an example of:Life Science
- 173.A client is experiencing persistent fatigue, muscle weakness, and frequent cramps. A blood test reveals low levels of calcium and phosphorus. Which of the following glands is most likely malfunctioning, leading to these symptoms?Life Science
- 174.A patient presents with symptoms including unexplained weight loss, chronic fatigue, and frequent opportunistic infections such as Pneumocystis pneumonia and Kaposi's sarcoma. Blood tests reveal a severely reduced CD4+ T cell count. These findings are highly indicative of which condition?Life Science
- 175.A biologist is studying a population of a certain species of plant in a forest. She observes that the plants exhibit a wide range of heights, from very short to very tall. Over several generations, she notices that both the very short and very tall plants are more successful at reproducing than plants of intermediate height. This pattern suggests which type of natural selection is occurring?Life Science
- 176.A nuclear power plant generates electricity by harnessing the energy released from the splitting of atomic nuclei. This process is known as:Physical Science
- 177.A scientist is investigating the properties of a noble gas. They observe that the gas is chemically inert and does not readily form compounds with other elements. Which of the following is the primary reason for this characteristic?Physical Science
- 178.A student is mixing oil and water in a beaker. No matter how vigorously they stir, the oil and water quickly separate into distinct layers once stirring stops. This phenomenon demonstrates that oil and water are:Physical Science
- 179.A student is designing an experiment to investigate the relationship between the force applied to an object and its resulting acceleration. They plan to use a constant mass and vary the applied force. Which fundamental law of physics is this experiment designed to demonstrate?Physical Science
- 180.A technician is setting up an electromagnet. They wrap a coil of wire around an iron core and connect it to a power source. To increase the strength of the electromagnet, which of the following actions would be most effective?Physical Science
- 181.A student is investigating how the speed of sound changes in different mediums. They measure the speed of sound in air, water, and steel. Which of the following trends is expected?Physical Science
- 182.A student is comparing the properties of two unknown substances. Substance X glows brightly when exposed to ultraviolet light, while Substance Y does not. This phenomenon, where a substance absorbs UV light and re-emits it as visible light, is known as:Physical Science
- 183.A technician is calibrating a sensor that measures light intensity. They notice that when the light source is moved farther away, the intensity measured by the sensor decreases. This observation is consistent with which principle of light propagation?Physical Science
- 184.A student is attempting to lift a heavy box using a lever. They place the fulcrum closer to the box and further from where they apply their effort. How does this arrangement affect the mechanical advantage of the lever?Physical Science
- 185.A chemist is performing an experiment where they combine two solutions, and the resulting mixture feels noticeably colder to the touch. What term best describes this type of reaction?Physical Science
- 186.A technician is preparing to weld two metal pieces together. They need to select a gas that will protect the molten metal from reacting with atmospheric oxygen and nitrogen. Which property of a gas is most important for this application?Physical Science
- 187.A student is observing an unknown solution. When they add a few drops of universal indicator, the solution turns a vibrant purple color. Based on this observation, what can the student conclude about the solution?Physical Science
- 188.A satellite is orbiting the Earth at a constant speed in a circular path. Although its speed is constant, the satellite is continuously accelerating. Which force is responsible for this constant acceleration?Physical Science
- 189.A student is observing a pendulum swinging back and forth. They notice that the pendulum eventually comes to a stop due to air resistance and friction at the pivot point. This observation demonstrates a real-world example of:Physical Science
- 190.A medical researcher is studying a group of individuals who exhibit a unique genetic trait: they are immune to a specific viral infection that commonly affects the general population. Further investigation reveals that these individuals have a mutation that prevents the virus from binding to the host cells. Which of the following components of the immune system is most directly responsible for recognizing and targeting virus-infected host cells, thereby preventing the spread of the infection within the body?Life Science
- 191.A public health official is investigating a sudden increase in cases of a mosquito-borne illness in a rural community. To control the spread of the disease, the official proposes a strategy that involves introducing sterile male mosquitoes into the population. This approach aims to reduce the reproductive success of the disease-carrying mosquito species. This strategy is an example of which type of disease control?Life Science
- 192.A marine biologist is studying a population of deep-sea hydrothermal vent organisms. These organisms thrive in environments devoid of sunlight, relying instead on chemical energy derived from inorganic compounds released from the vents. Which of the following terms best describes the primary mode of nutrition for these organisms?Life Science
- 193.A student is designing an experiment to investigate the effect of different types of soil on plant growth. They set up three identical pots, each with a different soil type (sandy, clay, and loam), and plant the same species of seed in each. All pots receive the same amount of water and sunlight. Which of the following is the independent variable in this experiment?Life Science
- 194.A biologist is studying a population of brightly colored frogs in a rainforest. She observes that these frogs secrete a potent toxin from their skin when threatened, deterring predators. This defense mechanism is an example of which of the following evolutionary adaptations?Life Science
- 195.A farmer observes that a particular variety of corn planted in a specific field consistently yields crops with stunted growth and yellowing leaves, despite adequate watering and sunlight. A soil test reveals a severe deficiency in a nutrient crucial for chlorophyll formation and overall plant vigor. Which of the following nutrients is most likely deficient?Life Science
- 196.A medical student is learning about the human immune system. They are taught that a specific type of white blood cell is primarily responsible for producing antibodies, which are crucial for neutralizing extracellular pathogens and toxins. Which of the following cells fits this description?Life Science
- 197.A homeowner is planning to install solar panels on their roof. They live in the Northern Hemisphere and want to maximize the energy output of the panels throughout the year. In which direction should the solar panels primarily face?Earth and Space Science
- 198.A geophysicist is analyzing seismic wave data from an earthquake. She observes that S-waves are unable to pass through a specific layer deep within the Earth. This observation provides key evidence about the state of matter of which Earth layer?Earth and Space Science
- 199.A team of researchers is studying a deep-sea ecosystem. They observe organisms that derive energy from chemical reactions rather than sunlight. This process is most likely:Earth and Space Science
- 200.A genetic counselor is explaining the inheritance pattern of a rare genetic disorder to a couple. The disorder appears in every generation, affects males and females equally, and an affected parent has a 50% chance of passing the disorder to each child, regardless of the child's sex. This pattern is consistent with which type of inheritance?Life Science