The 'greenhouse effect' causes global warming.
Which of these is the main cause of the greenhouse effect?

1.   ?    Carbon dioxide
2.   ?    CFCs
3.   ?    Sulphur dioxide
4.   ?    Carbon monoxide

Which of these environmental changes would result from global warming

1.   ?    Acid rain pollution
2.   ?    Breakdown of the ozone layer
3.   ?    Melting of polar ice
4.   ?    Destruction of rainforests

In the food chain shown below the algae were sprayed with a pesticide.
algae => water fleas =>minnow => trout = otters
Which of the organisms will build up the highest concentration of pesticide?

1.   ?    Water fleas
2.   ?    Minnows
3.   ?    Trout
4.   ?    Otters

Which box shows the effect of releasing CFC's into the atmosphere

1.   ?    Ultra-violet radiation decreases
2.   ?    Sea levels rise
3.   ?    Global temperatures rise.
4.   ?    Thickness of ozone layer decreases

Which box shows a method of reducing air pollution?

1.   ?    Using more renewable energy sources
2.   ?    Clearing tropical rainforests
3.   ?    Increasing the height of smoke stacks at power stations
4.   ?    Build power stations further away from towns and cities.

Which of the following is not a way in which energy is lost in a food chain.

1.   ?    Reproduction
2.   ?    Movement
3.   ?    Respiration
4.   ?    Keeping warm

Bacteria and fungi break down plant and animal remains.
Which box best describes bacteria and fungi?

1.   ?    Decomposers
2.   ?    Reducers
3.   ?    Predators
4.   ?    Transformers

Which box shows a problem that can be reduced by scrubbing waste gases given out a power stations?

1.   ?    Coal mining waste
2.   ?    Air pollution
3.   ?    Climate change
4.   ?    CFC's destroying the ozone layer

Food webs are more stable if

1.   ?    the number of links between organisms in the web is small
2.   ?    there is only one plant species at the start of the web
3.   ?    the number of links between organisms in the web is large
4.   ?    the web has marine life in it rather than land organisms

A accident at a factory results in organic waste being spilled into a river.
Just downstream from the spill the

1.   ?    number of freshwater invertebrates in the river will increase
2.   ?    number of bacteria in the river will decrease
3.   ?    oxygen level in the river will decrease

What scientific term is used to describe the number of animals of the same species living in a particular area?

1.   ?    Family group
2.   ?    Relatives
3.   ?    Linked species
4.   ?    Population

What chemicals cause the breakdown of the ozone layer?

1.   ?    CFCs
2.   ?    Acid rain gases
3.   ?    Carbon monoxide and carbon dioxide
4.   ?    Sulphur dioxide