Intro to Biology

A possible explanation to a problem that has not yet been tested. Educated guess.

• data

• theory

• hypothesis

• fact

This variable in an experiment is the one being deliberately changed by the scientist.

• dependent variable

• independent variable

• data

• control group

What step does every scientific experiment begin with?

• hypothesis

• question/problem

• procedures

• conclusion

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• type of plant

• the amount of sunlight

• the type of music

• the type of liquid

A student wants to test the effects of type of exercise on heart rate. What is the dependent variable?

• time of day exercise occurs

• amount of exercise

• heart rate

• type of exercise

All hypothesis are accepted.

• True

• False

An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and group B was given caffeine-free soda. One hour after drinking the soda, the pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda. The dependent variable in this experiment is the

• type of soda given to each group

• amount of soda given to each group

• pulse rate of each group

• age of participants in each group

Which type of data involves numbers that are obtained by counting or measuring?

• quantitative

• qualitative

What effect does fertilizer have on plant growth? Identify the correct step from the choices below.

• ask a question

• state the hypothesis

• collect the data

• draw conclusions

The variable that is being measured or observed is called the _______________. Hint: this is the variable that is the result or effect

• independent variable

• dependent variable

• control variable