ACT 2026 Practice Test Science Scientific Reasoning Free Quiz 1

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ACT 2026 Practice Test Science Scientific Reasoning Free Quiz 1

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ACT 2026 Practice Test Science Scientific Reasoning Free Quiz 1

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

General5 MCQs

1. A scientist observes that when predators are introduced to an area, the prey population declines. What can be inferred?

A. Predators have no effect on prey.B. Predation reduces the prey population.C. Predation increases the prey population.D. The relationship is unclear.

2. A study shows that the average temperature of a city has risen from 15°C to 17°C over the past 50 years. What can be concluded?

A. The temperature has not changed.B. The temperature has decreased.C. The temperature has fluctuated but not trended.D. The temperature has increased.

3. If a student hypothesizes that temperature affects plant growth, what would be a logical prediction?

A. Higher temperatures will lead to faster growth.B. Higher temperatures will lead to slower growth.C. Temperature has no effect on growth.D. Growth will be faster at intermediate temperatures.

4. A researcher hypothesizes that adding fertilizer increases plant growth. The data show that plants with fertilizer grow taller. What can be concluded?

A. The hypothesis is rejected.B. The hypothesis is partially supported.C. The hypothesis is supported.D. The results are inconclusive.

5. A student notices that the leaves of a plant are turning yellow. What is a plausible explanation?

A. Light deficiencyB. Nutrient deficiencyC. Water deficiencyD. Pest infestation

General5 MCQs

6. An experiment measures enzyme activity at different temperatures. The activity increases from 20°C to 40°C, then decreases at 60°C. What can be inferred?

A. The enzyme is inactive at all temperatures.B. The enzyme works best at 60°C.C. The enzyme is denatured at 40°C.D. The enzyme works faster at higher temperatures up to a point.

7. A student hypothesizes that plants grow taller in light than in dark. After an experiment, the light-grown plants are 30 cm and the dark-grown plants are 15 cm. What conclusion can be drawn?

A. The hypothesis is supported.B. The hypothesis is rejected.C. The hypothesis is partially supported.D. The results are inconclusive.

8. A student measures the oxygen production from different numbers of plants in a sealed chamber. Data: 1 plant → 2 mL, 2 plants → 4 mL, 3 plants → 6 mL. What can be concluded?

A. More plants produce less oxygen.B. The number of plants has no effect on oxygen production.C. More plants produce more oxygen.D. The relationship is inconsistent.

9. A gardener observes that plants with fertilizer are taller than those without. What can be concluded?

A. Fertilizer is harmful to plant growth.B. Fertilizer promotes plant growth.C. Fertilizer has no effect on plant growth.D. The results are inconclusive.

10. A student hypothesizes that water amount affects plant growth. The data show that plants with more water are taller. What can be concluded?

A. The hypothesis is rejected.B. The results are inconclusive.C. Water has no effect on growth.D. The hypothesis is supported.

📋 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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