Online Access Free GED-Science Exam Questions
| Exam Code: | GED-Science |
| Exam Name: | GED Science Exam |
| Certification Provider: | GED |
| Free Question Number: | 300 |
| Posted: | Sep 10, 2025 |
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The most realistic description of energy flow through an ecosystem is a food web that represents an interconnected series of food chains. In general, the greater the number of alternative channels through which energy can flow, the greater the stability of the food web and the ecosystem.
The diagram shows a typical food web for a wet meadow. The hawk and the fox obtain nourishment by preying upon rabbits, frogs, snakes, and mice. The fox may even eat grasshoppers. If, for example, the rabbit population is reduced, possibly because of bad weather during the breeding season, the fox and hawk would shift their predatory pressure to other forms of prey. The rabbit population would then have a chance to bounce back and the ecosystem would remain stable.
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In the food web diagram shown, which organisms directly consume the grasshoppers?
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Our genes consist of DNA molecules. DNA fingerprinting allows the detection of DNA fragment patterns in different people. In this process, enzymes are used to "cut" a person's DNA into pieces. The length of these fragments differs from person to person and, therefore, there is little chance that two or more people will produce the same pattern. The DNA fragments of different people can be readily compared. DNA fingerprinting has many applications in law enforcement, medicine, and other areas.
The diagram below lists simulations of the DNA "fingerprint" band patterns for six individuals-a missing child and five young people who have the missing child's physical characteristics.
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Based on the DNA diagram, which of the five children might be related to the missing child?
Which household compound is hazardous when combined with sodium hypochlorite, which is found in bleach?
Below is a graph of the world's population over the past 2000 years. The population size remained fairly steady until about the year 1200. As the standard of living started to improve, the human population began a period of rapid growth in the 1800s. By 1975, world population reached approximately 4 billion people. The projected population for year 2012 is 7 billion people.
Based on the information and graph, which statement best describes the growth of world population?
The pH of a liquid is a measure of its acidity or its alkalinity. Even small changes in pH of human blood can cause very serious health problems.
Carbon dioxide (CO2), is one of the dissolved gases present in healthy blood. CO2 normally mixes with the water in blood to form a mild acid, carbonic acid, which lowers the blood pH.If a health problem causes the dissolved carbon dioxide to increase or decrease, the blood's pH would change and could produce an unhealthy pH level.
Based on this information, which statement best summarizes the blood condition that might result when an individual has a respiratory condition that causes the blood to contain too much CO2?