Standard Grade Bitesize
Home > Biology > The biosphere > Control and management
An example of an industrial pollutant is:
Which of the following would reduce pollution by sulphur dioxide?
Burning household waste instead of burying it in land-fill sites
Fitting catalytic converters to all new cars and lorries
Scrubbing of fumes at coal-fired power stations
What do micro-organisms use the sewage for?
As an energy source
To keep warm
As a source of oxygen
Compared to clean water, water with sewage has
the same number of micro-organisms
What effect does sewage have on water oxygen concentration?
It stays the same
What effect does the extra energy the sewage provides have on the number of species able to live in a river?
Same number of species
What term do we use to describe an organism which shows the level of pollution in an area?
Pine Beauty moth caterpillars can strip the needles off whole forests of pine trees. To control the caterpillar population foresters use
Weeds compete with crop plants for nutrients, water and light. Farmers reduce this competition for resources by using