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Which gas helps plants make food during photosynthesis?
 
Carbon dioxide
 
Oxygen
 
Nitrogen
Cigarette smoke is harmful because it ____
 
Contains toxic chemicals
 
Contains clean gases
 
Has oxygen
Which of these helps reduce air pollution?
 
Planting trees
 
More cars
 
Burning rubbish
Why is air important to living things?
 
It contains gases needed for life
 
It is colourful
 
It is heavy
What happens when we breathe out?
 
Carbon dioxide leaves the body
 
Oxygen enters the body
 
Nitrogen is used by lungs
What happens when we breathe in?
 
Oxygen enters the lungs
 
Oxygen leaves the body
 
Carbon dioxide enters the lungs
Which gas is released when fuels like petrol are burned?
 
Carbon dioxide
 
Oxygen
 
Nitrogen
Which place is likely to have the most air pollution?
 
Busy road
 
Forest
 
Park
Why should scientists control variables in an experiment?
 
To get accurate results
 
To make it unfair
 
To finish faster
Which variable should be kept the same (controlled) in an air pollution investigation?
 
Type of measuring tool
 
Distance from road
 
Number of cars
When testing air pollution near roads, what is the independent variable?
 
Location
 
Pollution level
 
Weather
When measuring air pollution, what is the dependent variable?
 
Amount of pollution
 
Type of place
 
Time of day
Which tool can be used to observe air pollution levels?
 
Air quality sensor
 
Thermometer
 
Rain gauge
What happens to air quality when pollution increases?
 
It becomes worse
 
It becomes cleaner
 
It stays the same
Why is breathing polluted air harmful?
 
It can damage lungs
 
It helps lungs work better
 
It makes air heavier
Which of these is a source of air pollution?
 
Cigarette smoke
 
Fresh air
 
Wind
Which gas increases in the air when many cars are on the road?
 
Carbon dioxide
 
Oxygen
 
Nitrogen
Fumes from spray cans can pollute the air because they contain ____
 
Chemicals
 
Water droplets
 
Oxygen
Which activity causes air pollution?
 
Burning fuels
 
Planting trees
 
Rainfall
Smoke from burning rubbish is an example of what?
 
Air pollution
 
Clean air
 
Water vapour
Which of these is a harmful air pollutant?
 
Smoke
 
Oxygen
 
Nitrogen
Why is nitrogen the most common gas in the air?
 
It does not react easily
 
It is heavy
 
Plants make it
Which gas do we breathe out?
 
Carbon dioxide
 
Oxygen
 
Nitrogen
Which gas do humans need to breathe in to stay alive?
 
Oxygen
 
Nitrogen
 
Carbon dioxide
What gas makes up most of the air we breathe?
 
Nitrogen
 
Oxygen
 
Carbon dioxide
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