ACT 2026 Practice Test Science Scientific Reasoning Free Quiz 2

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ACT 2026 Practice Test Science Scientific Reasoning Free Quiz 2

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ACT 2026 Practice Test Science Scientific Reasoning Free Quiz 2

Practice ACT 2026 Practice Test Science MCQs from Scientific Reasoning. Get instant results with Explanation.

General5 MCQs

11. A student compares the number of leaves on plants grown in light and dark. The light-grown plant has 20 leaves, the dark-grown has 10 leaves. What can be inferred?

A. Light promotes leaf production.B. Light inhibits leaf production.C. Light has no effect on leaf production.D. The results are contradictory.

12. A student places potato cores in salt solutions of different concentrations and observes that the mass decreases in higher salt concentrations. What can be concluded?

A. Salt has no effect on the potato.B. Water moves into the potato.C. Water moves out of the potato.D. The potato absorbs salt.

13. A study finds that students who eat breakfast have higher average test scores than those who do not. What can be concluded?

A. Breakfast has no effect on test scores.B. Breakfast may improve test performance.C. Breakfast lowers test scores.D. The results are inconclusive.

14. A gardener observes that tomato plants in full sun produce more fruit than those in partial shade. What can be concluded?

A. Negative correlationB. No correlationC. Exponential correlationD. Positive correlation

15. A scientist measures the pH of a lake over time and finds it has decreased from 7.5 to 6.5 over 10 years. What can be inferred?

A. The lake is becoming more acidic.B. The lake is becoming more basic.C. The pH is constant.D. The change is too small to be significant.

General5 MCQs

16. A farmer tests the effect of fertilizer on crop yield. To support the hypothesis that fertilizer increases yield, what should the results show?

A. There is no difference in yield.B. The yield is lower with fertilizer.C. The yield is higher with fertilizer.D. The yield fluctuates with fertilizer.

17. A student measures the rate of photosynthesis at different light intensities and finds that the rate increases with light intensity. What can be concluded?

A. Light intensity has no effect on photosynthesis.B. Increasing light intensity increases the rate of photosynthesis.C. Increasing light intensity decreases the rate of photosynthesis.D. The rate of photosynthesis is independent of light intensity.

18. An experiment on enzyme activity shows that the rate increases from 10°C to 40°C and decreases from 40°C to 70°C. What can be inferred?

A. Temperature has no effect on enzyme activity.B. Enzyme activity increases linearly with temperature.C. Enzyme activity decreases with temperature.D. Enzyme activity increases with temperature up to a point, then decreases.

19. A scientist measures the biomass of plants grown in light and dark. The light-grown plants have twice the biomass of the dark-grown plants. What can be concluded?

A. Light is necessary for biomass accumulation.B. Light inhibits biomass accumulation.C. Light has no effect on biomass.D. The results are inconclusive.

20. A study finds that students who study for at least 2 hours have higher average test scores than those who do not study. What can be concluded?

A. Studying has no effect on test scores.B. Studying lowers test scores.C. Studying improves test scores.D. The results are inconclusive.

📋 ACT - Test Online Practice Quizzes

ACT

Conducting Body: ACT Education Corp

Frequency: 7-8 Times per Year | Time: 165 Minutes

Negative Marking: No

⚡ Test Pattern (Total: 171 MCQs):

English: 50 MCQs
Math: 45 MCQs
Reading: 36 MCQs
Science: 40 MCQs

Merit Formula: Merit_calculation = University/College Specific Weightage = Not Fixed Score_range = 1–36

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