Edexcel A-Level Biology A2 6p 6 Variables and Controls Questions

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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