Match the following glossary terms with their correct definitions:

• Hypothesis

• The purpose of the investigation

• Dependent variable

• The variable being tested and measured

• Control group

• The group in an experiment that does not receive the experimental treatment

• Aim

• The variable that is changed or controlled

• Independent variable

• A testable prediction

According to the notes, what should the title of a logbook include?

• Only the name of the experiment

• Reference to the variables being changed and measured, with enough detail for the reader

• The date of the experiment

• The names of the scientists involved

What is the independent variable in a scientific investigation?

• The variable that changes in response to the experiment

• The variable for which quantities are changed by the experimenter

• Anything kept constant or monitored

• The result measured by the experimenter

Fill in the blank: The temperature to which the enzyme catalase from lamb is exposed is an example of the __________ variable.

• independent

• dependent

• controlled

• extraneous

Fill in the blank: The volume of oxygen produced (as bubbles) from the breakdown of hydrogen peroxide, measured in millimetres using a ruler, is an example of the __________ variable.

• dependent

• independent

• controlled

• extraneous

Which of the following is a controlled variable in the experiment?

• The breakdown of hydrogen peroxide

• The temperature of the catalase

• Same mass of liver in each experiment (2 g)

• The volume of oxygen produced

What is a control group in an experiment?

• The group that receives the treatment

• The set-up or group in an experiment that does not receive treatment; it is used as the 'standard of comparison'

• The group that always receives a placebo

• The group that is expected to produce a result

What is a placebo?

• A substance that has a strong therapeutic effect

• A substance that has no therapeutic effect but may have a psychological effect

• A control group that receives a known response

• A method for measuring results

Fill in the blank: A negative control is a control group that _________

• isn't expected to produce a result

• always produces a positive result

• is used to increase the sample size

• is the main experimental group

Fill in the blank: A positive control is a control group that receives a treatment with a ________ response that can then be compared to the experimental group(s).

• known

• random

• delayed

• uncertain