Question 1

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

Accepted Answer

A tentative and testable explanation for an observed phenomenon.

Question 2

A group of students hypothesizes that the amount of alcohol produced in fermentation depends on the amount of glucose supplied to the yeast. What is the independent variable in this experiment?

Accepted Answer

The amount of glucose supplied

Question 3

Why is it important to test only one experimental variable at a time in a controlled experiment?

Accepted Answer

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

Question 4

Which of the following is a correct 'if/then' prediction based on the hypothesis: 'Rattle snakes come out at night because their prey is more active at night'?

Accepted Answer

If prey is more active at night, then rattle snakes will be more likely to hunt at night.

Question 5

In an experiment testing the effect of sunlight on plant growth, which variable should be plotted on the X-axis?

Accepted Answer

The amount of sunlight (hours per day)

Question 6

Which statement about hypotheses is TRUE?

Accepted Answer

A hypothesis must account for all available data.

Question 7

A student collects data on the number of mutant cells in three bacterial populations after UV exposure. Which type of graph is most appropriate to display this data?

Accepted Answer

Line graph

Question 8

Which of the following is an example of discrete data?

Accepted Answer

The number of male and female students in a class

Question 9

In a scientific experiment, what is the purpose of the control group?

Accepted Answer

To serve as a basis for comparison with the experimental group

Question 10

Which of the following best explains why the scientific method is considered self-correcting?

Accepted Answer

Hypotheses are refined as observations become more precise.

Question 11

A group of students investigates the loss of chlorophyll in autumn leaves from different tree species. What is the dependent variable?

Accepted Answer

The color of the leaves

Question 12

Which of the following is NOT a requirement for a well-constructed graph?

Accepted Answer

Using only part of the graph to display data

Question 13

A scientist wants to test if a new fertilizer increases plant growth. She gives one group of plants the fertilizer and another group no fertilizer. What is the experimental group?

Accepted Answer

The group that receives the fertilizer

Question 14

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

Accepted Answer

The variable that is measured as a result of changes to the independent variable

Question 15

A student hypothesizes that increasing the amount of sunlight will increase the growth rate of a plant. Which of the following is a valid prediction?

Accepted Answer

If the amount of sunlight increases, then the plant will grow faster.

Question 16

Which of the following is a key reason why experiments must be repeatable and verifiable?

Accepted Answer

To allow other scientists to confirm the findings

Question 17

A researcher collects data on the effect of different amounts of fertilizer on crop yield. Which variable should be plotted on the Y-axis?

Accepted Answer

The crop yield

Question 18

Which of the following is an example of a standard in an experiment?

Accepted Answer

A factor that remains the same in both the control and experimental groups

Question 19

A student is designing an experiment to test the effect of temperature on enzyme activity. Which of the following is the best way to ensure valid results?

Accepted Answer

Test only one temperature at a time while keeping all other variables constant

Question 20

Which of the following best illustrates the self-correcting nature of science?

Accepted Answer

Hypotheses are revised or rejected based on new evidence.

The Scientific Method: Foundations of Biological Inquiry

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