Pearson Edexcel IAL Biology 6P.6 Variables & controls

Practise identifying independent, dependent and controlled variables, then explaining how controls make practical results valid.

Exam points

state abiotic and biotic variables that could affect investigations
describe how a chosen variable is controlled and predict its effect if uncontrolled
apply positive or matched controls to isolate the factor being tested

[Maximum number: 3]

The diagram shows a spirometer that can be used to investigate human lung function.

A student used a spirometer to investigate the consumption of oxygen of a group of volunteers.

(a)

The student controlled several variables in this investigation.

[ 3 ]

(i)

State two biotic variables that could affect this investigation. (2) First variable Second variable

[ 2 ]

(ii)

Choose one of the variables you have identified in (i). Describe how this variable can be controlled. (1) Variable Method of control

[ 1 ]

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