VARIABLES

In the example experiment, what is the independent variable?

• Enzyme concentration
• Time taken for starch to be digested
• pH
• Temperature

What are prevention methods in a scientific investigation?

• The chance, high or low, that somebody could be harmed
• Strategies put in place to avoid any injuries
• Anything that may cause harm
• Anything that may cause harm, such as chemicals, electricity, extreme heat etc.

How can reliability be improved in a scientific investigation?

• By using a syringe to measure liquids
• By using a measuring cylinder
• By completing the experiment at each temperature more than once
• By calculating an average

What is the importance of planning a method for a scientific investigation?

• To justify a prediction using biological knowledge
• To identify variables
• To explain the concepts of independent, dependent, and controlled variables
• To produce accurate, reliable results

What is the purpose of a risk assessment in a scientific investigation?

• To identify variables
• To explain the concepts of independent, dependent, and controlled variables
• To justify a prediction using biological knowledge
• To prevent injuries

How does accuracy of a measurement depend on?

• The quality of the measuring apparatus
• The number of repetitions
• The skill of the scientist involved
• The quality of the measuring apparatus and the skill of the scientist involved

How can accuracy be improved in a scientific investigation?

• By calculating an average
• By using a syringe to measure liquids
• By completing the experiment at each temperature more than once
• By using a measuring cylinder

Where should appropriate units be written in a results table?

• In the data cells
• In the row heading only
• In both the column and row headings
• In the column heading only

In the example experiment, what is a controlled variable?

• Enzyme concentration
• pH
• Temperature
• Time taken for starch to be digested

What is a hazard in a scientific investigation?

• Strategies put in place to avoid any injuries
• Anything that may cause harm, such as chemicals, electricity, extreme heat etc.
• The chance, high or low, that somebody could be harmed
• Anything that may cause harm