Question 1

Which of the following best describes a hypothesis in the scientific method?

Accepted Answer

A tentative explanation that can be tested by experiments or observations.

Question 2

A scientist wants to test the effect of fertilizer on plant growth. She sets up two groups: one with fertilizer and one without. What is the independent variable in this experiment?

Accepted Answer

The presence or absence of fertilizer.

Question 3

In a controlled experiment, why is it important to have a control group?

Accepted Answer

To ensure that the results are due to the variable being tested.

Question 4

Which of the following is the correct order of biological organization from smallest to largest?

Accepted Answer

Cell, tissue, organ, organism, population

Question 5

A researcher measures the mass of a plant before and after a two-week experiment. Which variable is the dependent variable?

Accepted Answer

The change in plant mass.

Question 6

Which statement best explains why replication is important in scientific experiments?

Accepted Answer

Replication increases the reliability of results by reducing the impact of random errors.

Question 7

A biologist observes that fish in a pond swim closer to the surface in the morning. Which step of the scientific method is this?

Accepted Answer

Making an observation

Question 8

Which of the following best defines a community in biology?

Accepted Answer

All the populations of different species living and interacting in an area.

Question 9

A student collects data on the number of insects found under different types of leaves. Which type of graph would best display this data?

Accepted Answer

Bar graph

Question 10

Which of the following is an example of a biosphere-level study?

Accepted Answer

Examining the effect of pollution on all ecosystems on Earth.

Question 11

If a scientist wants to determine whether a new drug reduces blood pressure, which of the following would be the best experimental design?

Accepted Answer

Give the drug to one group and a placebo to another group, then compare blood pressure changes.

Question 12

Which of the following statements about scientific theories is correct?

Accepted Answer

A scientific theory is supported by a large body of evidence and explains a broad range of phenomena.

Question 13

A student wants to test the effect of temperature on enzyme activity. Which of the following is the best way to set up the experiment?

Accepted Answer

Use the same enzyme and substrate, but test at different temperatures.

Question 14

Which of the following is an example of an abiotic factor in an ecosystem?

Accepted Answer

The amount of sunlight in a forest.

Question 15

A researcher finds that increasing the amount of fertilizer increases plant growth up to a point, after which growth levels off. Which type of relationship does this describe?

Accepted Answer

A threshold effect

Question 16

Which of the following best describes the dependent variable in an experiment?

Accepted Answer

The variable that responds to changes in the independent variable.

Question 17

Which of the following is the best example of a population?

Accepted Answer

All the oak trees in a forest.

Question 18

A scientist collects data on the effect of pH on enzyme activity. She finds that enzyme activity is highest at pH 7 and decreases at higher and lower pH values. What type of graph would best represent this data?

Accepted Answer

A line graph

Question 19

Which of the following is NOT a characteristic of living organisms?

Accepted Answer

Ability to move

Question 20

Which of the following best describes the relationship between a hypothesis and a prediction?

Accepted Answer

A hypothesis is a testable explanation, while a prediction is a specific outcome expected if the hypothesis is correct.

Foundations of Scientific Inquiry and Ecology in General Biology

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