Easy GRE Science Passage Questions Practice Questions

Concept Explanation

Easy GRE science passage questions focus on identifying explicit details, determining the main idea, and understanding basic logical relationships within a scientific text. Unlike harder questions that require complex inferences or synthesizing multiple viewpoints, these questions usually ask you to locate specific information or summarize a clearly stated hypothesis. Success on these passages depends on your ability to distinguish between the evidence provided and the conclusion reached by the researcher. You do not need a background in physics, biology, or chemistry; the GRE Prep process emphasizes that all necessary information is contained within the text itself.

To approach these questions effectively, you should first identify the "scientific method" structure: What is the observation? What is the hypothesis? What was the result? Often, easy questions will mirror the wording used in the passage, making it easier to scan for keywords. For more comprehensive practice, you can explore GRE Reading Passage Questions Practice Questions to see how science passages compare to other genres.

Solved Examples

1. Identifying the Main Purpose

   Passage Snippet: "Recent studies of the Apis mellifera (honeybee) suggest that specific pheromones regulate the transition from foraging to nursing. While previous theories focused on age-based roles, these new findings highlight chemical signaling as the primary driver."

   Question: What is the primary purpose of the passage?

   1. To describe a newly discovered species of honeybee.
   2. To argue that age is the only factor in bee behavior.
   3. To present evidence for chemical regulation of bee roles.

   Solution: The correct answer is 3. The passage explicitly mentions that "specific pheromones regulate" behavior and that these are "new findings." This directly supports the idea of presenting evidence for chemical regulation.

2. Locating Specific Details

   Passage Snippet: "Geologists found that the shale layer in the basin was formed approximately 250 million years ago, during the Permian period. This layer is notably rich in organic matter compared to the sandstone above it."

   Question: According to the passage, how does the shale layer differ from the sandstone layer?

   1. It is older than the sandstone.
   2. It contains more organic matter.
   3. It was formed during the Triassic period.

   Solution: The correct answer is 2. The text states the shale is "notably rich in organic matter compared to the sandstone." While it may be older, the passage specifically highlights the organic content as the difference.

3. Understanding Relationships

   Passage Snippet: "When the enzyme catalase is added to hydrogen peroxide, the rate of decomposition increases significantly. Without the enzyme, the reaction occurs too slowly to be observed in a standard laboratory timeframe."

   Question: What is the effect of adding catalase to hydrogen peroxide?

   1. It inhibits the reaction.
   2. It changes the chemical composition of the final product.
   3. It speeds up the decomposition process.

   Solution: The correct answer is 3. The passage says the rate "increases significantly," which is synonymous with speeding up the process.

Practice Questions

1. Passage: The theory of plate tectonics explains the movement of Earth's lithosphere. Scientists believe that convection currents in the mantle provide the force necessary to move these plates. When plates collide, they can form mountain ranges or cause volcanic activity.

Based on the passage, what is responsible for the movement of tectonic plates?

1. Volcanic activity
2. Mountain range formation
3. Convection currents in the mantle
4. The weight of the lithosphere

2. Passage: In a controlled experiment, researchers found that plants exposed to blue light grew 15% taller than those exposed to red light. Both groups received the same amount of water and nutrients. The researchers concluded that light wavelength significantly impacts plant height.

Which of the following was a constant variable in the experiment?

1. The color of the light
2. The height of the plants
3. The amount of nutrients
4. The wavelength of light

3. Passage: Astronomers have observed that the star Gliese 581 has several planets orbiting within its habitable zone. This zone is the region around a star where temperatures are moderate enough for liquid water to exist on a planet's surface.

According to the passage, why is the "habitable zone" significant?

1. It is the only place stars can form.
2. It allows for the potential existence of liquid water.
3. It is where the largest planets are located.
4. It is characterized by extreme temperature fluctuations.

4. Passage: Mitochondria are often called the powerhouses of the cell because they generate adenosine triphosphate (ATP). This molecule serves as the primary energy currency for cellular functions. Cells with high energy demands, such as muscle cells, contain a higher density of mitochondria.

The passage suggests that muscle cells have many mitochondria because they:

1. Are larger than other cells.
2. Require a large amount of energy.
3. Produce more waste products.
4. Do not use ATP.

5. Passage: The Doppler effect describes the change in frequency of a wave in relation to an observer who is moving relative to the wave source. For example, as an ambulance approaches, the siren's pitch sounds higher because the sound waves are compressed.

According to the passage, why does a siren sound higher as it approaches an observer?

1. The sound waves are stretched out.
2. The ambulance increases its speed.
3. The sound waves are compressed.
4. The observer is moving away from the source.

6. Passage: Nitrogen fixation is a process by which molecular nitrogen in the air is converted into ammonia or related nitrogenous compounds in soil. This process is essential for life because fixed nitrogen is a required component for the biosynthesis of all nitrogen-containing organic compounds, such as amino acids.

According to the passage, nitrogen fixation is vital because it:

1. Removes harmful ammonia from the soil.
2. Produces oxygen for the atmosphere.
3. Allows for the creation of amino acids.
4. Prevents the biosynthesis of organic compounds.

7. Passage: Recent data from the NASA Mars Rover missions indicate that the Martian surface contains perchlorates. These chemical compounds lower the freezing point of water, suggesting that liquid brines could exist on Mars even in sub-zero temperatures.

The passage implies that perchlorates are important to Martian study because they:

1. Prove that Mars once had a thick atmosphere.
2. Make it possible for water to remain liquid in cold conditions.
3. Are the primary source of heat on the planet.
4. Indicate the presence of ancient volcanic activity.

8. Passage: Ocean acidification occurs when the ocean absorbs excess carbon dioxide from the atmosphere, resulting in a decrease in the pH of the seawater. This change can inhibit the ability of calcifying organisms, like corals and shellfish, to build their skeletons and shells.

What is a direct consequence of ocean acidification mentioned in the passage?

1. An increase in the pH of seawater.
2. A decrease in atmospheric carbon dioxide.
3. Difficulty for corals to form skeletons.
4. An increase in the population of shellfish.

Answers & Explanations

1. Answer: 3. The passage explicitly states that "convection currents in the mantle provide the force necessary to move these plates."
2. Answer: 3. A constant variable is something kept the same. The passage says "Both groups received the same amount of water and nutrients."
3. Answer: 2. The passage defines the zone as the region where "temperatures are moderate enough for liquid water to exist."
4. Answer: 2. The text links high energy demands (like in muscle cells) to higher densities of mitochondria because they generate ATP (energy).
5. Answer: 3. The passage explains that the pitch sounds higher "because the sound waves are compressed."
6. Answer: 3. The passage states that fixed nitrogen is required for the biosynthesis of amino acids.
7. Answer: 2. The text notes that perchlorates "lower the freezing point of water," allowing for liquid brines in "sub-zero temperatures."
8. Answer: 3. The passage states that the change "can inhibit the ability of calcifying organisms, like corals... to build their skeletons."

1. If a science passage states that a specific catalyst "lowers the activation energy" of a reaction, what is the most likely result?

• AThe reaction stops entirely
• BThe reaction occurs more quickly
• CThe reaction requires more heat
• DThe reaction changes color

Frequently Asked Questions

Do I need to be an expert in science to answer these questions?

No, you do not need specialized scientific knowledge because all the information required to answer the questions is provided within the passage. The GRE tests your reading comprehension and analytical skills rather than your memory of scientific facts.

How can I find the main idea of a science passage quickly?

Look for the thesis statement, which is usually found at the end of the first paragraph or the beginning of the second. Focus on verbs like "propose," "hypothesize," or "conclude" to identify the researcher's primary goal.

What are common trap answers in easy science questions?

Common traps include "extreme" statements that use words like "always" or "never" when the passage is more cautious. Another trap is the "true but irrelevant" answer, which provides a factually correct statement that wasn't mentioned in the text.

Should I read the questions before the passage?

Many students find it helpful to skim the questions first to know what specific details to look for, such as names of chemicals or specific years. This "active reading" approach can save time on easy-level passages.

How do I handle technical vocabulary I don't recognize?

Ignore the jargon and focus on the context; most technical terms are followed by a brief definition or a description of their function. You can also use GRE Vocabulary-in-Context Questions Practice Questions to improve your ability to define words based on surrounding text.