Question 1

Which of the following best describes a scientific hypothesis?

Accepted Answer

A testable statement that explains a phenomenon or a set of observations.

Question 2

In the context of hypothesis testing, what is the primary purpose of a null hypothesis ($$H_0$$)?

Accepted Answer

To propose that a particular variable has no effect on the outcome being studied.

Question 3

A researcher observes that students who attend supplementary instruction (SI) sessions have higher average grades than those who do not. Which of the following is the most appropriate alternative hypothesis ($$H_A) $$for this observation?

Accepted Answer

Students who attend SI sessions achieve higher scores than students who do not attend SI sessions.

Question 4

Which of the following best illustrates the process of hypothesis testing in biology?

Accepted Answer

Formulating a hypothesis, making predictions, and designing an experiment to test those predictions.

Question 5

In the giraffe neck length example, which prediction would support the food competition hypothesis?

Accepted Answer

Giraffes with longer necks feed at higher levels in trees than those with shorter necks.

Question 6

A student claims that 'giraffes have long necks because it helps them win fights for mates.' This statement is an example of which type of hypothesis?

Accepted Answer

Sexual competition hypothesis

Question 7

Which of the following is a key feature of a well-designed scientific experiment?

Accepted Answer

It includes a control group to compare against the experimental group.

Question 8

If the data collected from an experiment matches the predictions made by the alternative hypothesis, what is the most appropriate conclusion?

Accepted Answer

Reject the null hypothesis and accept the alternative hypothesis.

Question 9

Which of the following best describes the relationship between a question, a hypothesis, and an experiment in the scientific method?

Accepted Answer

A question leads to a hypothesis, which is then tested by an experiment.

Question 10

A biologist is studying the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. She measures the average height of plants in both groups after four weeks. Which statistical test would be most appropriate to determine if the fertilizer had a significant effect?

Accepted Answer

A t-test comparing the means of the two groups.

Question 11

Which of the following is an example of a mutually exclusive pair of hypotheses?

Accepted Answer

Students who attend SI sessions achieve higher scores than those who do not (alternative hypothesis), and students who attend SI sessions do not have different scores than those who do not (null hypothesis).

Question 12

Which of the following best explains why peer discussion is emphasized in biology courses?

Accepted Answer

Quality peer discussion enhances understanding and retention of material.

Question 13

A student is analyzing a graph showing the feeding heights of giraffes. The data show that most feeding occurs at shoulder height, not at the highest possible reach. What does this suggest about the food competition hypothesis?

Accepted Answer

The data do not support the food competition hypothesis.

Question 14

Which of the following is NOT a step in the scientific method as described in the course materials?

Accepted Answer

Accepting a hypothesis without testing.

Question 15

If a biologist wants to test whether a new drug affects heart rate in mice, which of the following would be the best null hypothesis ($$H_0$$)?

Accepted Answer

The new drug has no effect on heart rate in mice.

Question 16

Which of the following statements about the nature of science is most accurate?

Accepted Answer

Science is a process of asking questions and testing hypotheses by collecting and analyzing data.

Question 17

A student is designing an experiment to test whether light affects plant growth. Which of the following is the best prediction based on the hypothesis that 'plants grow faster in light'?

Accepted Answer

Plants exposed to light will have a greater increase in height compared to those kept in darkness.

Question 18

Which of the following is an example of 'evidence-based decision making' in biology?

Accepted Answer

Using data from controlled experiments to support or refute a hypothesis.

Question 19

A scientist collects data that do not match the predictions of the alternative hypothesis. What is the most appropriate next step?

Accepted Answer

Fail to reject the null hypothesis and consider revising the alternative hypothesis.

Question 20

Which of the following best describes the role of predictions in scientific experiments?

Accepted Answer

Predictions specify what should be observed if the hypothesis is correct.

BIO 150: Organismal & Ecological Biology – Course Introduction and Scientific Method

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