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GED Science

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Set · 2026-10

A student tests how light affects plant growth while keeping soil, water and plant variety constant. What is the independent variable?

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2026-10 · 30 practice questions with explanations

Original, independent study material. This is not an official exam paper.

U.S. GED Science skill practice emphasizes interpreting evidence, experimental design and quantitative reasoning in original scenarios. Single-best-answer review; not a full-length or official GED assessment.

20 questions on this page

  1. A student tests how light affects plant growth while keeping soil, water and plant variety constant. What is the independent variable?

  2. In a fertilizer experiment, one group receives no fertilizer while all other conditions are kept alike. What is the main role of that group?

  3. Why should an experiment use several plants in each treatment group rather than one?

  4. A student hypothesizes that warmer water dissolves a given mass of sugar faster. Which result would support this hypothesis?

  5. A table shows dissolved oxygen values of 9, 7 and 5 mg/L as water temperature rises. What pattern is shown?

  6. Three trials produce growth measurements of 8, 10 and 12 centimeters. What is the mean growth?

  7. A solution has a mass of 150 grams and a volume of 50 milliliters. What is its density?

  8. A cyclist travels 72 meters in 6 seconds at constant speed. What is the speed?

  9. A net force of 20 newtons acts on a 5-kilogram cart. What is its acceleration?

  10. A stationary book rests on a table. Which statement best explains why it does not accelerate vertically?

  11. A metal spoon warms when one end sits in hot soup. Which process mainly transfers heat along the spoon?

  12. Sunlight warms Earth's surface across the vacuum of space. What form of energy transfer makes this possible?

  13. An object is lifted onto a shelf. Which energy store increases because of its higher position in Earth's gravitational field?

  14. Which observation is strongest evidence of a chemical change?

  15. In a closed container, 12 grams of one reactant combine completely with 8 grams of another. What total product mass is expected?

  16. Which particle has a negative electric charge?

  17. Two isotopes of the same element must have the same number of which particle?

  18. Which cell structure is the main site of photosynthesis in plant cells?

  19. Which statement describes a main function of cellular respiration?

  20. In a simplified genetic model, two parents are Aa and Aa. What is the probability of an aa offspring?

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